B, but also C doesn't make sense. It doesn't make sense because how can you have 2 long-term sex and on top of that many threesomes, unless ALL the threesomes were only with the 2 long-term sex partners? Ignoring this fallacy and reducing the options to A and B, I say the answer is B. Think about how strongly you can recall the memory of being with someone who you've only been with, say, 1 to 4 times. You can probably remember various details of at least 3 if not all 4 incidents. Having sex an average of 500 times with 2 different guys doesn't really add to your "experience", though you likely did become more bedroom-adventurous along the way. On the other hand, having 20 partners an average of 5 times each means you have a strong idea of the variance in lovers, can perhaps even equate personality types with bedroom behavior, and have a generally different mindset towards men you come across in day-to-day life than if you've only had 2 long-term partners. So yeah, I say it's not quantity in amounts of sex, it's quantity in amount of lovers.