Hi....it's "web link bob" to the rescue again
ahahhaa
Check this link out:
http://hon.nucleusinc.com/enlarge....&A=1027
As you can see, the female Eurethra and Clitoris are VERY close to each other...so if your partner is rubbing up and down on your vaginal area, its a good bed he's running his fingers over your Eurethra (where you pee)...that opening is VERY VERY VERY sensative and thus the burning!
Show this illustration to your boyfriend so he gets a better idea of your "female geography" and can be more attentive to your needs!
hope this helps