What makes female rookies attractive?

[Frisk E. Coyote]

Oh you may not know it, even to yourself, but everyone has a beast loving side. Of course, everyone thinks its gross the first few dozen times, but then you realize things.

Of course, this only applies to the people who experiment! People who don't experiment are "safely" facing away from mating animals! Heck, if two rookies mated, I'd watch!