I know vaginal douches should be avoided at all costs, but if I'm considering anal sex, should I invest in an anal douche? I've seen a couple on (trustworthy) sex toy websites under the "sexual health" section, and they seem to be considered a good idea by users. But are they safe to use? And, er...how do you use them?! I'm pretty self-conscious, so I want to be assured everything's clean. And finally, should I invest in a specialised anal lubricant, or stick to my usual? Thanks so much.

My boyfriend and I have been sexually active for about two months now and were both virgins before this. We have always used condoms and it has always been enjoyable for both of us. However, many times after we have had sex I feel a dull ache around my lower abdomen or lower back area. I usually notice it within a couple of hours after sex. There have even been times when my stomache got upset afterwards and I have had pains from gas or simply got the runs. It is both uncomfortable and embarrassing. I was wondering if this is normal. What could be causing this? Is there anything I could do to fix it?