How do you know if a snails likes another snail?

When preparing to mate, snails often go through what may be described as a mating ritual which can involve playful biting and rearing up to one another. One of the most distinct examples of this is Helix pomatia, which rear up as if they are fighting and act as though they are kissing. This can go on for a number of hours. More often than not it is one stimulated snail trying to get another interested and it is not uncommon to see one snail wandering around with its penis hanging out of the genital aperture looking for another snail who is interested in mating.