Speaking as someone who has been married for 15+ years, and who has "been there and done that" I'll say it doesn't matter. What matters is how happy you are with your current partner and how happy he/she/it is with you. Quality over quantity and all that.
And speaking as someone who is a sarcastic wise-ass, I'd also like to say how hard it was not to respond "Three, and your mom counts as two of them because she's so damned fat!" Of course, I would never actually do such a thing because I've gotten along this far without incurring moderator wrath.
(Winces, and waits for the hammer to fall ;-)