Sex isn't a competition, and the sooner you get away from that the better. I know thats a typical guy fear, and I had those fears as well. You wouldn't fault her for running a marathon just because she trained with someone else.

If she does, then next time you see her just say "wow that rocks! Now show me how it works for you so we can experience it together as well". I'm sure she'll want to have as many as she can. ;)

I strongly believe sex triggers a bonding factor in both men and women. Basically; I think it's innate to the survival of our species and blue-printed in our hormonal system. Flooding our bodies and brains with oxytocine when we achieve orgasm. A hormone that not only bonds, but also heals and triggers more hormones that make us feel so good. You could almost say; pleasure is needed for our health, well-being and survival. Mother Nature may have wanted us to have sex to procreate, but she seems to also have been very eager on making us bond. As a rather vulnerable species with very vulnerable babies that need lots of long-term care, we'd better stick together and cooperate. Joining forces with those highly evolved brains of ours!

Still: note that bonding does not mean monogamy. It could mean romantic love. It could also mean friendship. Even an "I like you". Or just "I like the way we have sex". Which seems rather obvious you don't have sex with someone you don't like in one way or another :rolleyes:

Back to you. You two have bonded on some level during that year. I just can't tell you which. And she may bond with anyone she has sex with in one way or another. As you've noted yourself; there is some mental aspect to it and you have deliberately chosen to not let it get passed a certain level. Or have you? You seem potentially jealous about things that could potentially happen. Notice how you are stuck on "if's". If she has a g-spot orgasm. If she feels emotionally bonded to that person. If you'll ever meet again... And; if you had given her a gspot-orgasm. This is known as counter-factual- thinking and generally; not of much use. Why are you stressing over things you didn't do and could be happening, instead of being happy what you've done?

Also something worth realizing: most women don't achieve g-spot-orgasms. And an amazing orgasm doesn't depend on your gspot. You can't "give" her one. You may stimulate and anticipate, but we are responsible for our own orgasms. Don't caress ego too much ;) Last but not least, Firmus is right; sex is no competition.

Which means all together; you are being a bit silly :)

Humans evolved to breed by "sperm competition" in a multi-male - multi-female mating system within a foraging band of 100 to 150 persons of all ages and both genders. In such a system paternity, monogamy, jealousy all have no place and do not exist. They still do not exist in those "immediate return foragers" that are still around today. This system ensured bonds beween adults and afforded greater security for the children since every child could be his child. Sharing ensured our survival and "sperm competition" ensured our fitness since the most robust and fertile sperm donated by the most trilling lover "won". Letting their sperm fight it out inside meant the men did not have to fight each other outside thus permitting the men to become "a band of brothers".

Rather than FEARING losing her to some other man, do as Firmus suggests - capitalize on her gained knowledge.

I remember a scene from the TV series "House" in which House, talking about a date, says; "I bless the man who taught her the reverse cowgirl."

Sex is about what you do together, not about what either of you has done before. So loosen up, focus on the present of your relationship and let her teach you to be the best lover that she has ever had.