posing nude for a friend

i have a friend in visual arts class and for his final project this year he has to paint something around the theme of femininity and like, incorporate stuff they've learned about anatomy and all. he thought about just looking up pictures as a model to follow but it didn't really work for him since he felt like he was just copying someone else's work. so that's when he asked if i'd be down to pose for him, like naked. immediately i lean more toward yes, im okay with being seen naked and he's chill, also it's just sick to be the centerpiece of his painting like cmon. but maybe im thinking too fast. do i say yes?

edit: a lot of people are questioning why he needs me to be naked and find him suspicious for that. to be clear, when he talked to me about this he was ready to make a thousand compromises, even ask his teacher to allow clothing in case i felt uncomfortable with the nudity. i told him the nudity would be fine.