Possibly (NSFW) Why is my boyfriend sweating excessively during intimate relations?

My boyfriend seems to sweat quite a lot. Initially, I thought it was a one-off case of nerves. He told me that he sweats a lot, mostly from his face. I was okay with that(I like him and it wasn’t a huge issue)...until we started to have sex.
I literally felt as though I was under a rain cloud…except it was sweat. I know he was really self conscious and he kept apologising, but it’s a huge turn-off for me. The next time we had sex, it was even worse…his sweat was pouring down on top of my face. Tbh, it felt pretty gross. I like him and don’t want to hurt his feelings.
Does anyone have experience of this kind of thing? How best to handle it without bruising his ego? I could suggest different positions where I could avoid the downpour. Help :/