What is the difference between desire and pleasure for ghusl?

I am a bit embarrassed to talk about this but I need to ask: I read websites saying that ghusl is only necessary if the discharge that comes out is accompanied by pleasure and not just desire. However I have a problem: I don’t know the difference between these feelings. I read that for women the discharge also needs to be yellow and mine doesn’t seem to be yellow when aroused but I’m still unsure. I want to ask, if i feel my private parts clench/contract at a sexual thought, does that require ghusl? I feel weird asking this but I get clenches/contractions down there quite often when aroused and I’m aroused everyday so I don’t know if I actually have to do ghusl. It’s really stressing me out. It would be quite difficult to actually have to renew my ghusl for each prayer so that’s why I’m asking.