Congenital homosexuality can be differentiated from acquired homosexual behavior by its origins and phenomonology.
As I explained above, congenital (receptive) homosexuals can be identified by their specific endocrine and brain patterns. In nonhuman mammals this condition is directly observable by the behavior of lordosis: female mammals when faced with a sexually mature male will jut out their lower spine and remain very still, presenting the vagina to indicate sexual availability. Homosexual male mammals will engage in lordosis around other males. Homosexual female mammals will engage in mounting behavior identical to how the normal males do to females.
So congenital homosexuals by nature engage in opposite sex behavior - the females attempting to court and dominate a female, the males submitting to and genitally presenting to a male.
That explains congenital homosexuals - what's different about acquired homosexuals?
They are the exact opposite. They are extremely sex typical in their brain structure, hormonal patterns, and social behavior. They are paradoxically enough "extremely straight." The men have such high testosterone they become sexually indiscriminate and will fuck anything with a hole, animate or inanimate. The females will indiscriminately accept and submit to any dominant partner. This is why they are so likely to have several paraphilias - their sexuality and arousal are completely out of control and they do not attempt to inhibit their deviant behaviors. They are really "bisexual" - the males lust after females and penetrate other males out of dominance, and the females are like bonobo chimps, engaging in orgies with any participant though prefering to be penetrated.
So you get the different groups: congenital homosexual males ("bottoms"), acquired homosexual males ("tops"), congenital homosexual females ("butch"), and acquired homosexual females ("femme").