i dont know if mystery snails mate, i thought all snails were A-sexual, this is the photo, i touched them they broke and one kind floated mid air, they finally sunk and are doing it again. does it want its shell, one seems to be invading the other why the other is crawling away, as i write this Amber(gf) had to break them up again.. I dont know if i am reading to much but it doesnt look like a mutual thing lol??