Most Helpful Girl
I don't know about this. I think guys can be fairly easy to please when it comes to picking a girl just for sex. But when it comes to a relationship, guys seem even more picky than girls. I have dated several guys who were attracted to me, admired me and we got along well, and they still did not want me for a girlfriend. These were guys that did not fit some sort of big list of must-haves, they all had some sort of deal breaker for me, but overall I thought we were a good match and I would have entered a relationship with them.
My personal theory is that it is a bigger emotional risk for a guy to open up and fall in love, so you really need a whole bunch of things to exist before you will do so. And, honestly, I don't think you even know what those things are that will cause you to fall in love rather than just want to have sex and casual fun with a girl.