I have been finishing way too early with my gf. She has been getting frustrated and finally said something about it yesterday. We have been dating for 9 months and I still cum in about 3 min almost every time we have sex, sometimes I cum even sooner than that. She can get off on my tongue, but prefers to cum with me inside her. Sex has become less frequent and I wasn't sure why, but yesterday she explained that she has been faking a lot of her orgasms and that sex with me has become more like a chore for her. She explained that she doesn't want it as often, because she knows I will cum too fast and she won't get her orgasm. She also shocked me by telling me that she has only had about 3 REALLY good orgasms in the 9 months we have been dating. Said she does have smaller orgasms with me sometimes, but only maybe 1 for every 3 or 4 times we have sex. We have sex about 2 or 3 times a week.....some weeks more, some less.
She is the only girl I have ever had problems like this with...every other girl I have slept with I could last much longer and get them off (and I'm sure they weren't faking) multiple times before I would cum. She also commented that I am a really good size for her (she has only had one guy larger) and that she doesn't understand why I have problems and that I seem like I'm new to it all....like a virgin. I have been with less women than a lot of guys my age I'm sure, 6 to be exact. But I have never been unfaithful and dated one of them for 4 years and another one for 1.5 years.
A few weeks ago I found out how many guys she has slept with and I was a little shocked at the answer actually, although it may not seem like a lot to others. She is a 20 year old, straight laced girl, lost virginity at 16, petite, good body, very cute face, but a big flirt. She seems so sweet and innocent that I would have guessed she had been with maybe 3 guys before me. Then after getting to know her better and dating for a while I heard her mention other guys that she dated so the number I was thinking went up a little, maybe 5 guys I thought. Then I found out that she had cheated on at least 2 guys, so then I started thinking she might have slept with maybe 7 guys. It wasn't until I convinced her to tell me and she said she had to write them down that I realized I was probably thinking too low of a number. Turns out I'm the 15th guy she has slept with. I was a little shocked, but acted like it was not a big deal. So she has the experience to back her when she tells me that other guys don't cum that fast and they get her off much better.

She explained that she put up with it for the first few months, because she new I had not had sex in a while (almost a year) and thought I was just sensitive and would get back in the flow soon. Then she gave me a few more months thinking I just wasn't use to her and that I would eventually last much longer. But now she is fed up with not getting off and me getting mine every time.
I really want to be able to please my gf...I don't know what my problem is....she is only girl to ever make me cum so fast. Anyone have any advice for me to help me last longer and better please my woman?