Looking forward to the time when Dubv finds the period (.) key.
Anyway I've dated multiple women since 2003. I posted a timeline here awhile back of my various women. I try to maintain 2-3 women in my rotation at all times. In 2008 this dropped to one woman and I went on a somewhat desperate dating spree where I dated about 8 chicks in one summer. Although the gettin' was good back in the summer of '08 for some reason. It varies by year and by season.
The trick is not only to have enough women in your rotation (2-3) but have enough women on the sidelines so if one or two of those chicks drops out you can pick up a new one real quick.
I usually see and have sex with each of my girls once a week. I unfortunately have to dump the new girls who make it clear they want to get together more often than that--the ones who are pushing for a "boyfriend" they can hang out with on a nearly daily basis.
This usually happens: I meet a girl, we go out a couple of times, have sex, and then I decide whether I want her to be in my rotation. About 2 out of 3 don't get in, either because I don't enjoy having sex with them or because they want to get together more than once a week, and I think up some excuse to break up with them.
My best time was last year where I had two nearby girls I'd see once a week and a distant girl I'd see once every three weeks. I'd have 2 dates a week for two weeks, then 3 the next week, then repeat. This was somewhat time consuming but it was good. Sleeping with 3 girls in one week is rewarding. Especially when it becomes something that's not that big a deal. This went on for over a year and I considered all three my girlfriend.
It does get expensive though, and you need to constantly "prospect" for new women. But I run a small business so I'm used to searching for new clients and it's just something I do naturally.
And no, I don't tell them about each other and I show them great respect by doing everything in my power not to let them find out about each other. Once you understand how this works, you will understand women. Tiger Woods and Jesse James didn't get in trouble with their wives for sleeping with other women, they got in trouble for letting that fact get shoved in their wives' faces. Understand this and you'll understand women.