You do know a lot of straight models engage in homoerotic photoshoots not because it's their idea, but because it's the idea of a photographer/art director/creative director/editor?
At the end of the day if it makes you feel better to call him a closet case, do you. Perhaps he is bisexual and hasn't fully come to terms with it yet—he is young. But if he's not, teasing a straight guy for being comfortable in his skin and willing to do homoerotic content just seems like bullying. God forbid we actually move past gay-shaming/femme-shaming/toxic masculinity one day.