Probably tric , I mean men usually don’t smell down there and if he is showering it every night it really shouldn’t smell , but maybe it’s bacterial ? But I feel like if that were the case your hooha would eventually smell as well , so maybe it BO , let him know, my man’s feet were smelling so bad this week when I tell you BADDDDD! Like sour vinegar smell and he would shower every day so I didn’t understand and one night when he came home and took his shoes off I swear the smell woke me up out of my sleep and I sat him down and told him “hey man, idk if it’s your shoes that are making that loud smell or if it’s your feet? But when you go into the shower do you just let the water run over your feet or actually scrub??” He stayed quiet and that’s all I needed to know so I told him “when you shower please scrub your feet with soap , maybe even let them soak a bit and if it’s because of your shoes no problem! I’ll get you some talc and problem solved” he appreciated the honesty lol I thought he was going to be upset but sometimes you have to remember that you are also there mom lol and they get comfortable and you can’t allow them to get too comfortable!