Fine start you got here.
One change would be changing the spawn doors signs from "Horny boys goes from here" to "Horny boys come from here".
Also, something I thought for a perk when those come in, is a perk that makes some of the horny boys (and I assume maybe girls at some point :P) have a chance to try and sex eachother. The term is called 'infighting', but I guess in this game it would be 'insexing' :P
Other obvious things would be can't wait for more animations, models and textures being added but those come with time.