Why does it feel natural? The biblical answer is relatively straightforward. Like many other sins, homosexuality does not have to be learned. The child who never witnessed a temper tantrum can be proficient at throwing them; it is an instinctive ability of the human heart. Homosexuality is natural in the same way that anger or selfishness is natural. They are embedded in our fallen humanness. Indeed, homosexuality is “natural,” but only in the sense that it is an expression of the sinful nature… Sin is more than mature, rational, conscious decisions. It is our moral inclination from birth.
Edward Welch