If you're giving her extremely good sex, I'd say there's going to be about a 95% chance that she's not going to want to let you go. Women like to keep things around that make them feel good - it's why they have vibrators, enjoy spas, and have a high love of bubble baths. When a guy comes along who can make her feel even BETTER than the things listed above, there is no way she is going to want to let go of the person making her feel that way.
I had someone I was seeing my last semester in college. I was a virgin at the time, but I had always studied up on moves and ways to make a woman feel good in case I decided to have sex. This girl was pursuing me for 2 MONTHS before I finally gave in and "did the deed" with her. (Think of it as 2 months of extended foreplay if you will
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I guess I must have done a good job, because after we did it I could hardly get rid of her. I tried to stop talking to her several times, but each time she would either show up randomly at my apartment and try to bring me gifts (food, beverages, etc.) or leave notes on my car apologizing for doing stuff that might have made me mad (I wasn't, but that's not what she thought). I told her I was going to stay in my apartment near school during the summer, and she suddenly decided that "oh yeah, I'm going to stay in the area too!"
I managed to find a job out of state for the summer, and ended up spending most of my time away from her. Whenever I would come into town she would track me down, and I'd spend the night at her place making her feel REAL good
Eventually, it got old for me - I was tired of having relations with someone I had no feelings for - and I cut her off cold turkey. Man, you would have thought I bombed Iraq or something! She sent me emails, text messages, facebook messages, phone calls, etc. trying to get me back. She even wrote on her online journal how she wanted me back, and how she'd rather have me "make her feel good again for an hour" than "be miserable" like she feeling at the time (and, from what I hear, still does from time to time).
All because I gave it to her like no one else could.
The moral of this story: make sure you want to be with the girl BEFORE you have sex with her, 'cause if you don't she may be attatched, and TRUST me - getting rid of attatched chicks is a VERY hard thing to do!
