I'm Sag on the Scorpio cusp. Libras flock to me and get very attached to me. Don't know why. Got to the point that I had to make sure to stay away from anyone in the sign because I picked up a couple Libra stalkers. Sounds strange, but it truly seems to be the rule with me.
I, on the other hand, am attracted to Capricorns on a sexual level. They are a little too rigid on a personal level (I find they like to package everything into neat little boxes and never allow those things out of the boxes). I'm also, in error, attracted to Aries (who always end up trying to steamroll me). I think if I wanted an equal partner it would end up being Leo, even though I'm not generally attracted to them.
I wish there were a 13th sign because the only sign I've truly had luck with were Scorpios.