Choosing Between S & L

Who knew I would ever get to a place where two men that I find attractive would be wanting to have an affair with me so that I would have to choose between them? Yikes. How to choose? They each want just one woman like I want just one man, in the interest of lowering STD risk; they are each married and wanting a discreet physical only relationship; they are both charming in different ways, S being more smooth and L being very sweet

So here's where the differences lie on both the good and bad sides:
S Pros -- tall, gorgeous, outgoing, black (so sue me, I like the whole interracial thing), very good kisser
S Cons -- his schedule and mine are difficult to sync up, he can be a little too smooth at times, always vague about where and when to meet

L Pros -- feels "safer" to me somehow but can't quite pinpoint why, his schedule is flexible and can work around mine, has no problem finding and paying for hotel room
L Cons -- short (what can I say? I like 'em tall), possibly a little too laid back, have had no physical contact other than a handshake so don't know whether we will have that "spark" or not

Now S and I were supposed to meet after work yesterday, but he got caught at work and couldn't make it. We were possibly (not for sure, but possibly) going to take that big step yesterday. We decided to postpone until Friday. Of course, I'm not sure that he'll be able to make Friday, or if he'll call again to cancel at the last minute. Hmmmmm. . . frustration and uncertainty I've got plenty of already. Do I need more?

Add to this that I know my period is coming soon so that could delay everything by a week. Not that I have a problem with sex during my period, but I don't really want to have first time nervous sex during my period thankyouverymuch.

So here's my thinking (and yes I know I am just being hugely pragmatic here, using my little overactive accountant's brain to overanalyze and quantify everything and make it as unemotional as possible):

1. If my period holds off AND S can actually get together on Friday then we meet, and I decide if I'm going for it that day which I think I probably would, but I'm not sure.
2. If my period arrives today or tomorrow AND S can get together on Friday then we meet just to talk and become better acquainted, and I will schedule another lunch with L for next week to become better acquainted, making a choice between the two next week.
3. If S cannot get together on Friday, irregardless of my period, then I have lunch with L next week to make sure I'm really comfortable with him and move forward with L.

The longer I wait the more I'm suffering from cold feet, and then come the really big questions. Am I really going to be able to do this when the time comes? Can I really go get naked with a stranger and have sex with him? Really? Or am I playing some big mind game with myself? Am I going to back out at the last minute? I don't know. I just don't know. I guess only time will tell.