. Author manuscript; available in PMC: 2019 Jul 31.

Published in final edited form as: Perspect Sex Reprod Health. 2017 Mar 2;49(1):55–67. doi: 10.1363/psrh.12020

Table 4.

Distribution of sexual orientation indicators across sexual initiation latent classes, by biological sex

Females (n=1,628)
	Typical Debut % (n)	Dual Behavior Debut % (n)	Early Sexual Debut % (n)	Delayed Debut with Oral Sex % (n)

Class size	41.4% (655)	34.8 (564)	17.4 (293)	6.4 (116)

Sexual Identity ^***
100% Heterosexual ^a	18.7 (118)^d	15.3 (89)	19.5 (56)^d	10.7 (13)^ac
Mostly Heterosexual	66.4 (437)^bd	72.2 (397)^ad	65.5 (190)^d	35.4 (46)^abc
Bisexual	11.0 (63)^b	7.0 (46)^ad	8.5 (29)^d	17.9 (18)^bc
Mostly Homosexual	2.0 (20)^d	3.6 (19)^s	2.4 (8)^d	13.9 (9)^abc
100% Homosexual	1.9 (15)^d	1.9 (12)^d	4.1 (10)^d	22.1 (29)^abc
Lifetime Sexual Partnering ^***
Other-sex only	39.2 (271)^b	48.4 (269)^acd	33.3 (92)^b	29.9 (40)^b
Same sex + other-sex	60.8 (385)^bd	51.6 (295)^ac	66.7 (201)^bd	43.4 (51)^ac
Same-sex only	0	0	0	26.7 (25)
Pre-18 Sexual Partnering^***
None	10.9 (92) ^bcd	27.9 (161) ^acd	0.3 (≤3) ^abd	53.5 (66) ^abc
Other sex only	69.8 (456) ^bcd	60.5 (332) ^acd	83.7 (237) ^abd	19.2 (23) ^abc
Other sex + same sex	17.4 (94) ^b	10.9 (63) ^a	16.0 (54)	11.1 (15)
Same-sex only	2.0 (13) ^cd	0.8 (8) ^d	<0.01 (≤3) ^ad	16.2 (12) ^abc

Males (n=528)

	Single Behavior Debut % (n)	Multi Behavior Debut % (n)	Early Anal Sex % (n)	Very Early Debut % (n)

Class size	50.4 (273)	32.3 (169)	11.2 (52)	6.2 (32)

Sexual Identity ^*
100% Heterosexual ^a	23.3 (61)^c	19.4 (36)	12.0 (8)^ad	38.3 (9)^c
Mostly Heterosexual	38.8 (99)^b	51.9 (78)^acd	28.7 (16)^b	29.7 (9)^b
Bisexual	5.6 (18)	7.2 (13)	16.8 (6)	8.7 (≤3)
Mostly Homosexual	6.3 (28)	8.1 (14)	6.9 (≤3)	12.2 (7)
100% Homosexual	25.9 (66)^d	13.4 (28)^c	35.6 (20)^bd	11.2 (≤3)^ac
Lifetime Sexual Partnering ^ł
Other-sex only	28.7 (68)^cd	34.9 (58)^cd	15.5 (8)^ab	5.0 (≤3)^ab
Same sex + other-sex	48.3 (139)^d	54.2 (92)	59.4 (29)	72.9 (24)^a
Same-sex only	23.0 (66)^b	10.8 (19)^ac	25.2 (15)^b	22.1 (7)
Pre-18 Sexual Partnering^***
None	31.0 (95) ^cd	41.6 (77) ^cd	6.5 ^ab	0
Other sex only	32.8 (80) ^d	45.3 (67) ^d	28.5 (15)	11.8 (3) ^ab
Other sex + same sex	19.6 (53) ^bd	8.5 (19) ^acd	32.3 (16) ^b	49.0 (16) ^ab
Same-sex only	16.6 (45) ^abc	4.6 (7) ^acd	32.7 (19) ^ab	39.1 (13) ^ab

All column percentages weighted to reflect Add Health complex sampling design; all N’s are unweighted counts. Percentages may not add to 100% due to rounding and/or weighting. Sample included 6 respondents who had engaged in same-sex partnering, but did not report sexual orientation identity.

The sexual minority sample included those who either self-identified as a sexual minority, and/or who reported a history of sexual partnering with at least 1 partner of the same sex. Therefore, a number of respondents who identified as 100% heterosexual, yet had a history of same-sex sexual partnering, were included as sexual minorities.

Stars next to variable names indicate chi²-test [categorical variables]/F-tests [continuous variables] of significant difference in predictor distribution across class membership;

p<.05;

^**

p<.01;

^***

p<.001;

^ł

p<.10

Letter superscripts indicate if proportion in a given class is significantly different (p<.10) from other classes:

indicates significantly different than “Typical Debut” for females / “Single Behavior Debut” for males

indicates significantly different from “Dual Behavior Debut” for females / “Multi Behavior Debut” for males

indicates significantly different from “Early Debut” for females / “Early Anal Sex” for males

indicates significantly different from “Delayed Debut with Oral Sex” for females / “Very Early Debut” for males