Beyonce kinda suggests Jay Z is the only man she's been with.

"People would be surprised as to the lack of experiences I've had,' she says. 'When I was 12, 13 I had my first boyfriend, and he was my boyfriend till I was 17. At that age, that was a long time. I've always been very loyal and a little more mature. Though I was too young for it to really be a boyfriend - we didn't live together, we didn't, you know . . . That was my only experience with a guy, and since then I've only had one other boyfriend in my life - Jay" Beyonce to a British magazine

Hmmmm, do you believe her? 
It's possible sha. *cough*
lol