Anyone who has ever served in the military in an mos that has women involved will tell you it is a distraction. Guys constantly think of sex, having women around doesn't make that easier, the same would be said with gays in a unit. Any male who has served in the military would tell you that the most efficient units they have been in were all males, it's nothing against females, I have seen many females perform very well but a female is always a distraction in a unit, especially an attractive one.
I agree, just follow the militaries policy of dont ask dont tell and a gay can serve.