Jesus wasn't asked if the people who were killed at Siloam were killed because of sin, and he didn't say that they weren't.

Luke 13, 1-5 At that time some people who were present there told him about the Galileans whose blood Pilate had mingled with the blood of their sacrifices.
He said to them in reply, “Do you think that because these Galileans suffered in this way they were greater sinners than all other Galileans?
By no means! But I tell you, if you do not repent,b you will all perish as they did!
Or those eighteen people who were killed when the tower at Siloam fell on them—do you think they were more guilty than everyone else who lived in Jerusalem?
By no means! But I tell you, if you do not repent, you will all perish as they did!”

Complimentarity of the sexes is a natural reality. 

Natural is not whatever happens in nature. Sexual relations between creatures of the same gender is contrary to nature, because it is contrary to their gender and the form of their bodies.