"To put the "mating-like" behavior into perspective, you see dogs mount, fixed or not, both males and females do this (I have an alpha female, she mounts all the time). This has nothing to with sex, its a dominance display."
On the other hand, male common frogs will try to mate with other males or bits of wood or whatever while sexually excited during mating sessions, but do not otherwise spend their time in dominance displays, so it is quite likely that their behaviour is indeed sexual and not about domination.
I am not sure that we actually know in which category the behaviour of guppies fall. To me they seem more sexually inclined than territorial, but I suppose that is debatable. I think we may assume that their sexuality is very different from humans anyway.
Another thought, if we are going to anthropomorphosize (??) and compare fish behaviour to humans, perhaps it would be sensitive to keep away from negative value-laden words such as "messed-up"; a forum this size is very likely to have gay members, who might feel very alienated. Even I felt a bit taken aback simply because of the very good gay friends I have had. I am sure nobody meant to be offensive, but we need to be inclusive.
bye bye dan and stand! 
