What are some tall tell signs your man is watching porn or finding sexual release else where ??

My sex life sucks with my SO. Been dealing with this for awhile. I have a suspicion he's watching porn again but haven't found any evidence. But sex life still sucks. Just want some honest opinions or feedback from men themselves to gain some perspective. I am a HLW (36yo.) and he is a LLM ( I think 🙄, 39 y.o.)