How many romantic interests do your Sims usually have?

It really varies by the sim. I have one guy who I swear is always going to be true to his One - his computer. He and his computer are inseparable and I got tired of trying to pair him off with another sim. Now he lives in limbo, but I see him often anyway, as a random townie. In general, I'll let them chat with a few people before deciding who they are going to marry.