Semen is something that will make sex better or worse sometimes, and it purely depends on the girl. First off, most girls will not even talk about it and that's just how it usually is. Like, are you going to cum? What in the fuck am I supposed to do with the cum? The girl simply doesn't know so it escalated in a way that is somewhat weird. You may even end up cumming on the ground because all of you are very uncertain of what this thing should escalate into. In the end, all of you probably agreed that the girl should swallow because this is the one method that will ensure that the place doesn't get messed up and it will also ensure that no one's clothes will get dirty. This is all pretty great, so we need not talk about it much more. However, let's talk about the people who didn't get to experience this by now. I can only encourage you to get down to watch these videos before doing anything. In real life it would be hard to make these things up on the go, so you should make sure you know what you're doing.