Table 3.
Distribution of sexual initiation indicators within 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) |
| Number of types of sexual acts, mean | 2.7 | 2.6 | 2.8 | 1.6 |
| Timing of first sexual encounter, mean age (yrs) | 15.3 | 16.36 | 13.25 | 18.14 |
| Anal sex Before age 18, %(n) | 14.8 (74) | 0 | 27.9(83) | 0 |
| Spacing Between 1st and 2nd Behaviors, (yrs) | ||||
| Multi-behaviors | 14.8 (74) | 100 | 0 | 0 |
| 1 | 40.8 (261) | 0 | 14.6 (51) | 8.1 (12) |
| 2 | 28.4 (198) | 0 | 7.6 (19) | 7.7 (9) |
| 3–5 | 11.3 (89) | 0 | 56.5 (156) | 12.0 (13) |
| 6+ | 4.6 (33) | 0 | 21.3 (67) | 17.7 (15) |
| Single lifetime | 0 | 0 | 0 | 54.6 (67) |
| First sexual behavior, %(n) | ||||
| VI first | 58.1 (407) | 0 | 87.8 (256) | 20.2 (30) |
| OS first | 27.1 (174) | 0 | 11.1 (30) | 79.8 (85) |
| AI, no VI | <0.1 (≤3) | <0.1 (≤3) | 1.1 (7) | <0.1 (≤3) |
| VI/OS | 8.4 (46) | 95.8 (544) | 0 | 0 |
| AI/VI | 6.3 (26) | 4.2 (19) | 0 | 0 |
| MALES (n=526) | ||||
| 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) |
| Number of types of sexual acts, mean | 2.3 | 2.5 | 2.6 | 2.8 |
| Timing of first sexual encounter, mean age (yrs) | 16.3 | 17.9 | 14.0 | 10.0 |
| Anal sex Before age 18, %(n) | 11.0 (29) | 0 | 100.0 | 56.9 (16) |
| Spacing Between 1st and 2nd Behaviors, (yrs) | ||||
| Multi-behaviors | 0 | 99.8 (168) | 91.2 (47) | 0 |
| 1 | 37.1 (96) | 0 | 3.6 (≤3) | 8.2 (≤3) |
| 2 | 19.0 (62) | 0 | 0 | 4.8 (≤3) |
| 3–5 | 23.0 (21) | 0 | 2.3 (≤3) | 5.9 (≤3) |
| 6+ | 6.7 (21) | <0.1 (≤3) | 0 | 76.4 (25) |
| Single lifetime | 14.2 (33) | 0 | 3.0 (≤3) | 4.7 (≤3) |
| First sexual behavior, %(n) | ||||
| VI first | 23.0 (81) | 0 | 0 | 1.0 (≤3) |
| OS first | 75.7 (189) | 0 | 0 | 80.8 (26) |
| AI, no VI | 1.3 (≤3) | 12.6 (25) | 55.5 (29) | 18.2 (4) |
| VI/OS | 0 | 81.6 (135) | 35.1 (17) | 0 |
| AI/VI | 0 | 5.8 (9) | 9.4 (6) | 0 |
VI= Vaginal Intercourse; OS= Oral Sex; AI= Anal Intercourse
All column percentages weighted to reflect Add Health complex sampling design; all N’s are unweighted counts. Cells with counts ≤3 reported as such due to Add Health reporting requirements. Percentages may not add to 100% due to rounding and/or weighting.