Oh, I don't know, a few things come to mind...
He answered, “Have you not read that he who created them from the beginning made them male and female, and said, ‘Therefore a man shall leave his father and his mother and hold fast to his wife, and the two shall become one flesh’?" (Matt. 19:4-5)
A little farther along:
For there are eunuchs who have been so from birth, and there are eunuchs who have been made eunuchs by men, and there are eunuchs who have made themselves eunuchs for the sake of the kingdom of heaven. Let the one who is able to receive this receive it.” (Matt. 19:12)
Perhaps he'd say:
"[S]eek first the kingdom of God and his righteousness . . . (Matt. 6:33)
Or, maybe he'd say:
"[F]rom now on sin no more." (John 8:11)
In fact, this one also seems especially apropos:
But I have this against you, that you tolerate that woman Jezebel, who calls herself a prophetess and is teaching and seducing my servants[c] to practice sexual immorality and to eat food sacrificed to idols. I gave her time to repent, but she refuses to repent of her sexual immorality. Behold, I will throw her onto a sickbed, and those who commit adultery with her I will throw into great tribulation, unless they repent of her works, and I will strike her children dead. And all the churches will know that I am he who searches mind and heart, and I will give to each of you according to your works. (Rev. 2:20-23)
In fact, I rather doubt Jesus would have very nice things to say to anyone who practised flagrant sexual sin in his name.
City Church thinks Jesus was a libertine or something