Last night was my (24F) first sleepover at my boyfriend’s (29M) place. He bought me lingerie as a gift. It’s beautiful, but the sort of thing you wear for 5 minutes at a time. When we were getting ready to sleep, I put on some boxers and a large t-shirt, which are very comfy. My boyfriend asked why I didn’t put the lingerie on for bed. I told him I loved it, but it’s a bit scratchy to sleep in. He was super upset that I “dressed like a man.” I told him that this is just what I wear to bed, to which he responded that it’s fine when I’m alone, but it makes him sick when I’m with him. I guess I don’t really know the couples’ sleepover etiquette.