When a guy sets fire to his loved-one's pubic hair, just prior to ejaculation, then pulls out and extinguishes the flames with semen before they result in a 'scorched earth' type situation.

Good method of contraception, who really wants to remain inside with a burning bush pressed against their stomach?

A sex move where one takes an enema, does a handstand, and squirts diarrhea all over the other person/room/goat/etc. (For those that dont know, Mt. Vesuvius was the volcano that covered Pompeii in ash, desroying the city.)

When someone inserts peeled ginger into someone else's anus.
The receiving end's anus should quickly feel like it is erupting.

A term used to describe the sudden, violent overflowing of carbonated beverages. A beverage is said to have "Gone Vesuvius" when it sprays or foams beyond the confines of its designated container.