I've never had 2C-B so I can't draw a comparison... I've heard its quite erotic though from a number of my friends.
With this particular mescaline experience, we couldn't help it... There were three of us and myself and my partner left the other one to her own devices while we went and did our thing... It was incredible. And unlike the hedonistic drugs that push things too far to recover from, it strengthened our relationship. The only thing was the awkwardness for a week about the skeletons coming out. We just didn't talk about it but then they came out again and there was no closet anymore. lol.
What amazed me was that sex was not a problem at all. Especially given that the 2-carbon phens, MDA, MDMA, methylone, and mephedrone all made it damn near impossible for me.