Bah There is two types of sex. Sex by Choice and Sex that is coerced.
Coerced Sex can be divided into two categories. Sex wherein another forces you to engage in such (Rape) and Sex wherein some mental disorder forces you to engage in such Example: Nymphomania.
Since most of the Gays and Lesbians aren't raping their partners nor are they constantly having sex like someone suffering from Nymphomania is apt to do they we can logically deduce they are making a conscious choice where and with who they are having sex.
Thus their lifestyle is a choice. Nothing more.
The noob is engaging in a bit of logical fallacy.
At one time I had an article that strongly refuted this idea of biological basis. Maybe I still have it on an old PC. I don't know. Anyway, it doesn't matter to me one way or another. It's just that I don't believe it to be biological, and I believe God's proclamation against it in the Bible. That's all I need to know. Biological/choice, either way, God sees it as an abomination.