my partner has ....

taken oiled up naked pic's of himself I caught him doing it and he jumped , anyway he says they're just for himself but I feel a bit funny about them ? I know I'm probably being paranoid but he hasn't sent them to me ! I just don't understand why he'd want naked oiled up pictures of himself ! urgh he's not deleted them either after I said I don't feel comfortable with it ! today I checked his work rota too and he only had 3 hour's on it , he's been out since 9.30 am and when I text asking what time he's home he said 4 , that's 6 and a half hours !