Did Jesus Ever Teach against Homosexuality?

Questions about how to respond to someone who claims Jesus never taught against homosexuality, who also doesn’t consider anything outside the Gospels to be authoritative, and advice for befriending a lesbian couple without appearing to condone their lifestyle.

• How should I respond to a friend who claims Jesus never taught against homosexuality and who also doesn’t consider anything outside the Gospels to be authoritative?
• Any advice for befriending a lesbian couple without appearing to condone their lifestyle?