Why you such a player for?

Okay, I know I said I wasn't going to bitch, so I'm going to try. Really, really hard.

But seriously. Must you be such a player?
Just to clear it up, readers, I'm probably not talking to all of you. Not even most of you. Probably none of you.
But a certain somebody, who is a good friend of mine, asked me to lie to some girl, and basically help him to get into her pants. Which I was willing to do. Because, you know, I'm a nice, supportive friend, who is an absolutely fucking terrible influence on such young children as this one. So I did it.
Then, about 10 hours later, I realised something.

I know who this chick is.

My next thought went something like this:
OMGWTFshithellassballswhattheWHYrageemoconfusedGRARjeez
THAT IS A TERRIBLE THING TO DO TO A PERSON.

Now I'm kinda torn. Because however much I want him to get laid and be less irritatingly sexually frustrated, she's actually a really nice person. And yes, it has occured to me to ask her for her opinion, but really, I'm not one for much talking with people genuinely about feelings and such. Like, if I talk to you about my feelings, or actually listen to you rant on about yours, you are a very special person. Because feelings are very muchly out of my range, similar to human emotions. But I digress.

I don't understand the point of this at all. If you want to fuck somebody so badly, hire a hooker. What is the point of putting all that effort into fucking some chick and then having her kick you to the curb when she finds out you're a total juicebag? People try to explain to me the mentality behind it, but I just don't get it.