My boyfriend follows nude and sexual accounts on Twitter and Tik Tok. Is it a red flag?

My boyfriend and I had a little break up but now we started to talking again. He's generally nice to me. After break up he became nicer. But I noticed that he followed a lot nude accounts on Twitter/Tik Tok lately. His accounts have zero follower and he using these accounts just for following nudes. I don't know why he needed this. We have great sex life and I send him nudes too. It makes me sad that he's satisfiying himself by looking at other girls. Also it shocked me because normally he wouldn't follow these thing and he generally has high libido but he isn't a sex addict. He is stili having sex with me and want me to send nudes. He said he likes me so much. So why he needed this? He's working a full time job and we can't have sex in these days. Is this a active? Is this a red flag? Everything is good expect this. What should I do?
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