noun
loss of virginity (female); defloration
Refers specifically to a female's first sexual experience. The term is clinical and somewhat formal; in casual contexts, expressions like 初体験 or 初めて are more common.
See also: 童貞喪失
処女喪失の平均年齢は国によって異なる。
The average age of loss of virginity varies by country.
Refers to loss of male virginity, whereas 処女喪失 is specifically for females.
Compound of 処女 (virgin, maiden) and 喪失 (loss). The exact historical derivation is uncertain, but the term is a straightforward Sino-Japanese compound.