The curious thing is that Jesus is not quoted in the Gospels as saying anything about homosexuality. (Jesus does refer to Sodom and Gomorrah, e.g., saying of towns that do not welcome his disciples that it will be better for Sodom and Gomorrah in the day of judgment than those towns. This doesn't say anything directly about homosexuality, however, for the following reason: It can be argued that the important part of the story of Sodom is not that it deals with homosexuality but instead rape. Same-sex rape, but rape. So that aspect of Sodom, not being welcoming to travelers by treating them violently, may have been what Jesus had in mind. Also consider Ezekiel 16:49:
Now this was the sin of your sister Sodom: She and her daughters were arrogant, overfed and unconcerned; they did not help the poor and needy.)
You're right of course, Jesus did speak against fornication. He also spoke against divorce, but most Protestants and Evangelicals no longer understand that teaching to be binding on Christians. (Catholics of course do.)