My 24 Female Boyfriend, 27 Male, Doesn't Want Me to Model for Long Charade or Swimwear

My 24 Female Boyfriend, 27 Male doesn't want me to model for long charade or swimwear. My boyfriend is okay with me not wearing a bra as long as my nipples aren't too visible. He has expressed his discomfort with me doing the same with my friends without him. I've tried communicating to him that it's a creative outlet and more so artistic than sexual.