Two. As of July, it will be only one.

2 for the last year, and in total (my ex and my boyfriend).

Two.

Oh, just in the last year, eh? Well, that's not nearly as interesting as the number of sex partners ever, but there's probably a thread or five on that already, somewhere. I've been dating and in an exclusive relationship with my partner for a bit over two years, so the answer to this question would be: just the one.

However, my lifetime count is much higher.