Boyfriend cheating

So today I was with my SO and while he went to have a shower I decided to go Christmas shopping on his laptop but then I went and had a look through his history and I see that he had several pages of an online chat room and searches of 'pay for sexy web show'.

I don't know what to do and how to confront him without him manipulating it and just lying straight to my face and make something up as to why he was searching that.

Girls what would you do x

UPDATE: he said that he went and searched for it, looked around but realised it was wrong and got off of the website. I don't know wether to believe him. Help