Huh, TIL

https://www.kqed.org/science/1446777/everything-you-never-wanted-to-know-about-snail-sex

When snails copulate, two penises enter two vaginal tracts. Both snails in a pairing transfer sperm, but whichever snail got in the best shot with the dart has a better chance of ultimately fertilizing eggs.

First they stab eachother. The better the stab, the more effective the stabber's sperm will be. Then they exchange fluids. Then they settle down, buy a minivan, and waste away in an office until they die.