Are Sylvari's homosexual?
They are pansexual as far as we can see. They don’t see love based on gender/sex. There are plenty of heterosexual Sylvari couples: The Shield of the Moon storyline is based on one. There are only two homosexual Sylvari relationships I’ve managed to find and I spend more time in the Grove than I should. (Caithe and the Green Knight couple.)
If you chill around the Grove I promise you you’ll overhear Sylvari talking about their different sex love interest.