It's mostly an ego thing indeed, most guys wanna believe they can make the girl cum either through fucking or foreplay, foreplay...with your gf/partner...maybe, with a WL...very unlikely, not impossible but the chances are very low, I mean there's nothing wrong with wanting to please the other side, I used to have the same mindset when I was younger, more ego etc, nowadays I'm paying hard-earned cash so I can enjoy myself/cum, not paying to please the other side (most times it will be an act anyway, "oh, I cum!"....not).