Does anyone else suffer with cystitis very very regularly?

I've been with my boyfriend for a year now and we have sex regularly (1-2 times a night sometimes more) and we're both very clean people. I wee after sex every time but for some reason I still get it!!!

When I feel it coming on we abstain for as long as it takes to go. I've been to the doctors twice to get them to investigate it now but nothing's come if it.

Just wondered if anyone's had the same experience ?? Xxx