1. Pineapple, cherries, cinnamon, ginger will change the taste of men and women. On the other hand, so will garlic, onions, asparagas, and curry.
2. As stated above, diet can sometimes contribute to vaginal odor, but most more than likely it is bacteria. Oddly enough, my ex never cared for the way I tasted and I wasn't crazy about the way he tasted. My current bf loves the way I taste, and I can't get enough of him either...so personal chemistry may have something to do with it.
3. having a full bladder can sometimes make it hard to cum.
4. Love many of the suggestions here. Take your time. Communication is key, but so is experimentation. Sometimes kissing her pussy the way you kiss her mouth works well. i love it when my bf spreads my pussy wide open and licks above, and below my clit, and not just on it. He spends time all over, but when I start to buck, he really hones in and focuses on my clit and inner lips. He will also stop in the middle and slide his fingers inside to play with my g-spot- that really gets me going, and then back to my clit. Ass and perinum play rock.
As far as orgasm, for years, I thought I was a one orgasm only woman..I could get myself off more than one, but my partner couldn't. My current bf can get me off 5-10 times in an evening -depending on what he's doing....it's a wonderful thing. And yes, sometimes the orgasms are so intense, I cry. Or laugh...