noun, noun or participle which takes 'suru', intransitive verb
intravaginal ejaculation
Medical/technical term for ejaculation inside the vagina. Can be used as a noun or with する to describe the act.
膣内射精は妊娠の可能性を高める。
Intravaginal ejaculation increases the chance of pregnancy.
彼は避妊せずに膣内
He ejaculated inside the vagina without contraception.