Kind of an off the wall question - will platy's interbreed? For example, suppose you had a male sunset, and a couple of females like a red wag and a blue, would they breed? If so, what kind of fry would you get?
Heck, not only will they interbreed but they'll cross with swordtails and variatus platys as well. In fact, any platy or swordtail you see in the LFS is a cross. That's why the male platys are so aggressive these days, and why the swordtails are so piddly small.