My (33m) fiancé went to a bucks and I (30F) found a message on his phone asking his mate for condoms

So my fiancé went to a bucks on the weekend, he was being sus when he was messaging me at the party so I decided to check his messages when he got in at 4am. There were two messages from the night, one to one of his friends asking if he was ‘getting busy’ and another to his other mate asking for 2 condoms. No replies to either. There were 2 girls from Partistaff there and photos on his phone of one of his mates giving one of the girls a massage whilst she lay hot on top of another guy in his boxers. He claims both messages were a joke and they took the photos as a joke but I’m having the hardest time believing it. I went through other bucks party messages and one said “the things she would do, the things she has done” followed by the drool emoji and then “Christ this bucks… will be big”

Do I believe him or are sexual things happening at these bucks?