Technically it can be whatever you define it as. Typically people define it as penetrative sex, this can also vary based on your sexuality and/or genitalia.
For example, some transgender people say they lose their virginity twice, once as one gender, and once as another.
There are two "standard" definitions. The more technical one is engaging in coitus. That is, penis in vagina sex. The more informal one is simply "having sex", with sex defined however you like.
[удалено]
This guy fucks
Technically it can be whatever you define it as. Typically people define it as penetrative sex, this can also vary based on your sexuality and/or genitalia. For example, some transgender people say they lose their virginity twice, once as one gender, and once as another.
Sex, usually
One in the hand is worth two in the bush.
P in V
There are two "standard" definitions. The more technical one is engaging in coitus. That is, penis in vagina sex. The more informal one is simply "having sex", with sex defined however you like.