Table 2.
Median debut ages of selected sexual actions among heterosexuals in Norway (Kaplan–Meier survival analysis; median values and confidence intervals in parenthesis)
| Birth cohort (age group) | |||||||
|---|---|---|---|---|---|---|---|
| 1931–1950 (70+ yrs) |
1951–1960 (60–69 yrs) |
1961–1970 (50–59 yrs) |
1971–1980 (40–49 yrs) |
1981–1990 (30–39 yrs) |
1991–2002 (18–29 yrs) |
Sign | |
| Men | |||||||
| Receptive vaginal sex (fingers, penis or an object) | – | – | – | – | – | – | |
| Insertive vaginal sex (fingers, penis or an object) |
21.2 (20.0–22.5) |
18.6 (18.2–19.1) |
18.7 (18.4–19.0) |
18.9 (18.3–19.5) |
18.5 (18.2–18.9) |
18.6 (18.2–18.9) |
χ2 = 54.6, 5 d.f., p < 0.001 |
| Oral sex with a female partner |
35.6 (24.6–46.7) |
21.7 (20.3–23.1) |
20.2 (19.7–20.8) |
19.4 (18.4–20.2) |
19.1 (18.7–19.5) |
19.2 (18.3–20.0) |
χ2 = 158.1, 5 d.f., p < 0.001 |
| Oral sex with a male partner | – | – | – | – | – | – | |
| Receptive anal sex (fingers, penis or an object) | – | – | – | – | – | – | |
| Insertive anal sex (fingers, penis or an object) | – | – | – |
35.2 (26.8–43.6) |
37.0 (32.9–41.1) |
26.9 (24.9–29.0) |
χ2 = 308.4, 5 d.f., p < 0.001 |
| (n = 327) | (n = 273) | (n = 383) | (n = 302) | (n = 385) | (n = 314) | ||
| Women | |||||||
| Receptive vaginal sex (fingers, penis or an object) |
20.2 (19.3–21.1) |
18.1 (17.7–18.4) |
17.7 (17.2–18.2) |
17.3 (16.9–17.7) |
17.4 (17.0–17.8) |
17.7 (17.3–18.2) |
χ2 = 71.6, 5 d.f., p < 0.001 |
| Insertive vaginal sex (fingers, penis or an object) | – | – | – | – | – | – | |
| Oral sex with a female partner | – | – | – | – | – | – | |
| Oral sex with a male partner | – |
25.9 (22.0–29.7) |
20.8 (19.2–22.4) |
19.4 (18.7–20.0) |
18.8 (18.4–19.2) |
18.3 (17.9–18.6) |
χ2 = 283.2, 5 d.f., p < 0.001 |
| Receptive anal sex (fingers, penis or an object) | – | – | – |
30.2 (26.7–33.7) |
30.2 (25.9–34.6) |
25.9 (24.6–27.2) |
χ2 = 293.4, 5 d.f., p < 0.001 |
| Insertive anal sex (fingers, penis or an object) | – | – | – | – | – | – | |
| (n = 180) | (n = 267) | (n = 300) | (n = 268) | (n = 375) | (n = 441) | ||
“–” = not available. Tested for statistically significant group differences by means of log-rank test