The determinants of a pornography actress’s career life

Figures & data

Figure 1. Survival analysis chart. Source: This study.

Table 1. Definition of variables.

Variable	Definition
Career life	The number of months in which the actress worked in the A.V. industry during the study period January 2002 and June 2014 (unit: month)
Debuting age	The actress’s age in the A.V. industry when she first acted in A.V.s
Single A.V. actress movies	The total number of single films of the actress in her A.V. career
Cup	The definition of A = 1, B cup = 2 cup… in order to M cup = 13 on
Tokyo	Dummy variable, 1 = the actress was born in Tokyo, 0 = not born in Tokyo
Model	Dummy variable, 1 = the actress also serves as a model entertainer, 0 = other
Risky-sex movies	The actress in the occupation in the past eight seasons, such as male superior, actress sex performance accounted for more than one person, or shooting S.M., abuse, high risk of pregnancy caused by the total number of categories or other violent sexual activities of the movie to a healthy body
The ratio of single A.V. actress movies	The actress in a single piece of A.V. industry occupation published all her works for all proportions
The ratio of single A.V. actress movies in current season	The actress in a single piece last season when a quarter of all works published accounts for the proportion

Data source: Digital Media Mart website.

Table 2. Descriptive statistics.

Variable	Observations	Average	Variance	Least value	Crest value
Career life	605	38.754	28.844	2	162
Debuting age	605	22.511	4.289	18	56
Single A.V. actress movies	605	36.226	45.952	0	405
Cup	605	4.808	1.949	1	13
Tokyo	605	0.398	0.490	0	1
Model	605	0.367	0.482	0	1
Risky-sex movies	605	6.441	8.709	0	93
The ratio of single A.V. actress movies	605	0.407	0.261	0	1
The ratio of single A.V. actress movies in current season	605	0.339	0.338	0	1

Data source: same as Table 1.

Table 3. Statistics of different age groups.

Age cohort	Sample ratio	Tokyo	Model	Risky-sex movies
18–20	28.93%	44.00%	38.86%	85.71%
21–25	59.83%	38.40%	37.85%	83.70%
26–30	7.11%	39.53%	25.58%	76.74%
31–35	1.82%	27.27%	27.27%	81.82%
36–40	1.01%	50.00%	16.67%	83.33%
41–45	0.49%	33.33%	33.33%	66.67%
Above 45	0.83%	20.00%	20.00%	80.00%

Data source: same as Table 1.

Table 4. Statistics of the proportion of different cups of female stars.

Cup size	Sample ratio	Tokyo	Model	Risky-sex movies
A	1.16%	42.86%	14.29%	71.43%
B	6.45%	33.33%	30.77%	76.92%
C	20.83%	41.27%	30.95%	84.13%
D	20.50%	42.74%	41.13%	79.84%
E	19.83%	37.50%	37.50%	83.33%
F	12.73%	35.06%	35.06%	90.91%
G	9.59%	36.21%	34.48%	86.21%
H	4.63%	42.86%	42.86%	85.71%
I	2.15%	69.23%	61.54%	84.62%
J	0.99%	66.67%	50.00%	83.33%
K	0.66%	25.00%	50.00%	100.00%
L	0.33%	0.00%	50.00%	50.00%
M	0.17%	100.00%	100.00%	100.00%

Data source: same as Table 1.

Table 5. Regression results.

The explanatory variable: ln(Career life)	OLS1	OLS2	OLS3	OLS4	OLS5
Debuting age	–0.006	–0.005	–0.005	–0.002	0.0004
	(0.008)	(0.007)	(0.006)	(0.005)	(0.006)
Cup	0.030*	0.130**	0.094*	0.110**	0.103*
	(0.017)	(0.064)	(0.054)	(0.047)	(0.053)
Cup square		–0.010*	–0.008*	–0.010**	–0.009**
		(0.006)	(0.005)	(0.004)	(0.005)
Single A.V. actress movies			0.022***	0.017***	0.020***
			(0.001)	(0.001)	(0.001)
The square of single A.V.			–4.88e-05***	–3.85e-05***	–4.34e-05***
actress movies			(4.90e-06)	(4.26e-06)	(4.83e-06)
Model	0.629***	0.552***	0.199***	0.257***	0.232***
	(0.067)	(0.067)	(0.061)	(0.053)	(0.060)
Tokyo		0.143**	0.062	0.045	0.068
		(0.065)	(0.055)	(0.047)	(0.053)
Risky-sex movies		0.020***	–0.014***	–0.014***	–0.014***
		(0.004)	(0.004)	(0.003)	(0.004)
The ratio of single A.V.				–1.350***
actress movies				(0.092)
The ratio of single A.V. actress					–0.499***
movies in current season					(0.080)
Constant	3.118***	2.720***	2.612***	3.196***	2.688***
	(0.194)	(0.247)	(0.209)	(0.185)	(0.204)
Observations	605	605	605	605	605
R-square	0.140	0.188	0.421	0.574	0.579

Note: standard error values are in parentheses; *, **, *** mean 10%, 5%, 1% statistically significant levels. Data source: same as Table 1.

Table 6. Robust check, multicollinearity check for variance inflation factor, heteroscedasticity check for White test.

The explanatory variable: ln(Career life)	VIF in OLS1	VIF in OLS2	VIF in OLS3	VIF in OLS4	VIF in OLS5
Debuting age	1.008	1.013	1.014	1.014	1.030
Cup	1.009	15.896	15.979	15.987	15.991
Cup square		15.913	15.976	15.996	15.995
Single A.V. actress movies			6.564	6.945	6.932
The square of single A.V. actress movies			4.860	4.994	5.021
Model	1.017	1.062	0.810	1.242	1.244
Tokyo		1.016	0.975	1.026	1.025
Risky-sex movies		1.043	1.607	1.608	1.608
The ratio of single A.V. actress movies				1.114
The ratio of single A.V. actress movies in current season					1.113
Mean VIF	1.011	5.991	6.030	5.547	5.551
p-Value for White’s test (H0: homoscedasticity)	0.122	0.000	0.000	0.035	0.000

Data source: same as Table 5.

Table 7. Robust check, weighted regression results.

The explanatory variable: ln(Career life)	WLS1	WLS2	WLS3	WLS4	WLS5
Debuting age	–0.003	–0.0004	–0.005*	–0.010***	–0.013***
	(0.004)	(0.004)	(0.003)	(0.002)	(0.003)
Cup	0.034*	0.099	0.038	0.095**	0.071*
	(0.017)	(0.064)	(0.053)	(0.045)	(0.041)
Cup square		–0.007	–0.004*	–0.009**	–0.007*
		(0.006)	(0.005)	(0.004)	(0.004)
Single A.V. actress movies			0.023***	0.017***	0.020***
			(0.002)	(0.001)	(0.002)
The square of single A.V. actress movies			–5.50e-05***	–4.15e-05***	–4.71e-05***
			(5.50e-06)	(4.86e-06)	(5.46e-06)
Model	0.553***	0.467***	0.161***	0.325***	0.220***
	(0.070)	(0.069)	(0.061)	(0.053)	(0.059)
Tokyo		0.117*	0.14	0.069	0.031
		(0.067)	(0.057)	(0.049)	(0.055)
Risky-sex movies		0.024***	–0.012***	–0.011***	–0.013***
		(0.004)	(0.004)	(0.004)	(0.004)
The ratio of single A.V.				–1.339***
actress movies				(0.088)
The ratio of single A.V. actress					–0.568***
movies in current season					(0.082)
Constant	3.039***	2.685***	2.520***	2.886***	2.505***
	(0.143)	(0.208)	(0.173)	(0.147)	(0.165)
Observations	605	605	605	605	605
R-square	0.108	0.164	0.411	0.574	0.455

Note: standard error values are in parentheses; *, **, *** mean 10%, 5%, 1% statistically significant levels. Data source: same as Table 1.

Table 8. Survival analysis results.

The explanatory variable	Result1	Result2	Result3	Result4	Result5
Career life	Hazard ratio	Hazard ratio	Hazard ratio	Hazard ratio	Hazard ratio
Debuting age	0.992	0.993	0.996	0.993	0.992
	(0.014)	(0.013)	(0.012)	(0.011)	(0.012)
Cup	0.918***	0.735***	0.771***	0.740***	0.761***
	(0.025)	(0.063)	(0.075)	(0.064)	(0.067)
Cup square		1.022***	1.023***	1.028***	1.024***
		(0.007)	(0.009)	(0.007)	(0.007)
Single A.V. actress movies			0.958***	0.956***	0.960***
			(0.004)	(0.004)	(0.004)
The square of single A.V.			1.000***	1.000***	1.000***
actress movies			(1.46e-05)	(1.09e-05)	(1.08e-05)
Model	0.381***	0.423***	0.829***	0.682***	0.792**
	(0.040)	(0.047)	(0.100)	(0.083)	(0.094)
Tokyo		0.823*	0.863	0.888	0.868
		(0.086)	(0.089)	(0.099)	(0.101)
Risky-sex movies		0.960***	1.027***	1.033***	1.028***
		(0.009)	(0.009)	(0.008)	(0.007)
The ratio of single A.V.				11.507***
actress movies				(2.531)
The ratio of single A.V. actress					1.527**
movies in current season					(0.263)
Observations	605	605	605	605	605
Log likelihood	–2281.327	–2262.373	–2164.046	–2103.931	–2159.711

Note: robust standard error values are in parentheses; *, **, *** mean 10%, 5%, 1% statistically significant levels. Data source: same as Table 1.

Table 9. Robust check, survival analysis results with other distributions.

The explanatory variable: Career life	Weibull regression			Exponential regression
	Result3	Result4	Result5	Result3	Result4	Result5
	Hazard ratio	Hazard ratio	Hazard ratio	Hazard ratio	Hazard ratio	Hazard ratio
Debuting age	0.993	0.991	0.990	0.993	0.992	0.990
	(0.012)	(0.011)	(0.012)	(0.012)	(0.011)	(0.012)
Cup	0.759***	0.724***	0.747***	0.830*	0.828*	0.825**
	(0.074)	(0.072)	(0.073)	(0.081)	(0.082)	(0.081)
Cup square	1.025***	1.030***	1.026***	1.016*	1.016*	1.016*
	(0.009)	(0.009)	(0.009)	(0.009)	(0.009)	(0.009)
Single A.V. actress movies	0.958***	0.956***	0.959***	0.970***	0.973***	0.971***
	(0.004)	(0.004)	(0.004)	(0.004)	(0.004)	(0.004)
The square of single A.V.	1.000***	1.000***	1.000***	1.000***	1.000***	1.000***
actress movies	(1.44e-05)	(1.37e-05)	(1.49e-05)	(1.59e-05)	(1.58e-05)	(1.63e-05)
Model	0.823*	0.674***	0.784**	0.830*	0.763**	0.805*
	(0.099)	(0.082)	(0.095)	(0.099)	(0.092)	(0.097)
Tokyo	0.845	0.874	0.857	0.947	0.975	0.949
	(0.087)	(0.089)	(0.088)	(0.096)	(0.099)	(0.097)
Risky-sex movies	1.027***	1.033***	1.028***	1.013*	1.013*	1.014**
	(0.009)	(0.009)	(0.009)	(0.009)	(0.009)	(0.009)
The ratio of single A.V. actress movies		12.393***			3.503***
		(2.625)			(0.666)
The ratio of single A.V. actress			1.566***			1.366***
movies in current season			(0.220)			(0.195)
Observations	605	605	605	605	605	605
Log likelihood	–562.037	–497.958	–557.121	–638.683	–618.491	–636.371

Note: robust standard error values are in parentheses; *, **, *** mean 10%, 5%, 1% statistically significant levels. Data source: same as Table 1.