1. Good sex to me is just having a lot of fun while doing it!
2. No I don't think so, but it's definitely a plus and would make it better sex.
3. I didn't until my current partner. I never orgasmed until James (well, except for clitoral orgasms if the guy so chose to do so).
4. Girl on top is helpful, especially if you have a cock ring that touches the clit! But also, any G-spot position is amazing.
5. On average, I'd say 2-3.
6. Most I've had is 5.
7. I don't now, but have in the past.
8. Best advice for 'good sex' I could give is to be open with your partner about what you want and like, find out what your partner wants and likes, act out fantasies for each other, etc. And if you want, look for a video called The Ultimate Guide to the G-Spot (I think that's what it was called) and watch it together. Ever since we watched it, James has been able to get me to do the whole female squirting/ejaculation thing!
Also, foreplay is hugely key!