Fornication and adultry are desires, desires that can fester up in our hearts and minds if we don't "look away". Take it some homosexuality is "desirous" to some also, but what i'm saying for the most part, some have been destroyed mentally.
homosexuality is a CHOICE in most people. Yea some are hormonally unbalanced, but when Jah destroyed Sodom and Gomorrah, all CHOSE to remain even tho Lot tried.
SO basically its a gross sin and CAN be overcome.