Thanks for all of the replies, everyone. I'm sorry I haven't had a chance to respond yet.
Lots of helpful advice so far, and it has definitely encouraged me towards doing this. I'm still a little reluctant, but more because of the logistic/selection/etiquette kind of issues than the fundamental decision behind them. If anyone has any recommendations, advice or opinions that they would prefer to send by PM, that would be much appreciated.
In response to some of the questions that have been raised-->
Location:
East end of Ottawa
How far I've gone before:
Handjobs and BJs, but never to completion. Drunken/awkward kissing, more stressful than pleasurable.
What truly constitutes "losing your virginity":
I appreciate the philosophical probing behind this line of thought, but for my purposes I'm only really interested in the physical act. I don't regret never having a fulfilling relationship, because I believe that it's something worth waiting for. I do regret missing out on sex for pleasure without any commitments. For the obvious reason that it would have been fun, and also because the lack of experience will probably make it harder to form a physical connection with any potential "civilian" lovers.
Infatuation with an SP:
I can definitely see how this is a danger, but like I said above, I'm more concerned with the physical aspect than the emotional one at this point. Although, admittedly, it may be presumptuous of me to assume that they are separable. The last thing I want is to become a character in a bad, quirky 1980s coming-of-age movie, though, so I would be very careful to compartmentalize my emotions if I went through this experience.
Once again, thanks so much for discussing this with me.