Depends. Are they an attractive humanoid and have the same... naughty bits that we do? If so, yeah, I would. It would be impossible to have kids with them, which may or may not be a plus, and certainly any diseases attuned to a species to radically different genetically (despite the convergent morphological evolution) would be unlikely to cross over (you'd be more likely to contract tobacco mosaic virus from a plant and have it make you sick). This means sex would likely be less risky than it would be with another human.