Ok, just cause they like to have sex doesn't mean they've forgotten what they're doing. Thy are teenagers after all, all hormones and bad ideas...
Max will never leave the family, he might take a short vacation, but he'll always come back.
As for sex's and Petra, don't worry, she is gonna become more feminine...I was just building to the DP scene (Trying to write out of my comfort zone.) But she's gonna still use her special purpose, just not so much in the future.
Oh and we have straigh guy and a straight girl. Evan and Jenna; I can add a T-Girl if you want...
What do ya think T-girl in the family?