My boyfriend's very monogamous, and I chose him because he's better than any woman OR man.
I'm bisexual and like both. Every queer person I know, to include myself (who prefers women and has a queer brother and a queer best friend), is an individual and is not more or less feminine/masculine than straight counterparts.
Also, someone who is smaller does not necessarily "have the body of a ten year old boy." I weigh 110 lbs. at 5' 5". have a 23.5" waist, but D cup (natural) breasts and wide 34" hips and a big butt.