coitus

n.

（尤指人类的）交媾，性交；交配；

1. The vagina receives the penis during coitus.
   阴道在性交过程中容纳阴茎。
2. Reaching orgasm long after the beginning of coitus is a common male dysfunction.
   性交长久以后才达到性高潮是男性常见的性功能障碍。

Initiation of coitus in early adolescence.
Seasonality of coitus and seasonality of birth
Age at first coitus. A marker for risky sexual behavior in women.
PANTY FOR HEIGHTENING SEXUAL EXPERIENCE DURING COITUS
WOMAN'S HEATING DEVICE FOR HEIGHTENING SEXUAL EXPERIENCE DURING COITUS
Fertilization of the mouse egg and the effect of delayed coitus and of hot-shock treatment
Fertilization of the mouse egg and the effect of delayed coitus and of hot-shock treatment.
Measurement of intra-vaginal and intra-uterine pressures during human coitus by radio-telemetry.
Seminal Fluid Induces Leukocyte Recruitment and Cytokine and Chemokine mRNA Expression in the Human Cervix after Coitus
Ovarian activity, circulating hormones, and sexual behavior in the cat. I. Relationships during the coitus-induced luteal phase and ...