Heterosexuality
Heterosexuality involves union between two people of different genders. It is the natural way that human beings and most animals reproduce. Heterosexual attraction is natural; that is, men for women, and women for men. Heterosexual union within marriage is the only form of sexual activity endorsed by God as His Word as revealed in the Bible.
Theories on how one becomes a heterosexual
God created man in his image. Man was mortal, and thus had to procreate in order to continue the species. Two men were not suitable to God for this, so God made woman from man. And so, man continues to be heterosexual due to the correct genetic information being passed down from Adam and Eve. Those who choose homosexual sex reject the natural order and superior genetic line established by God's creation.
Alternatively, the theory of evolution explains that the success of a species has determined and has been determined by the competitive practices of each species. Species that procreate are better equipped to survive than those that do not or can not. Heterosexuality presented an opportunity for genetics to be passed on more readily than through homosexuality. Those whose genes determined their personalities to be more obsessed with heterosexual intercourse were naturally more successful in procreation (and thus at passing on their genes) than those who looked to the same sex for procreation (whose genes were less likely to be passed on). This has, however, presented the issue of how homosexuality has been able to survive.
See also