I have two males and two females. Can't say wether or not I prefer one or the other. My females seem to be more attached to me. My males seem more indepedent.

As for humping, my female does that more than on oldest male. Neutering will certain make his urges less, but a lot of humping has to do with dominance.

As for the "penis sticking out" my oldest male doesn't have that problem. However, my 6 month old shows his once in a while. Mostly when he is excited. He just got neutered on Friday so we'll see wether or not that changes.