I would certainly recommend that you and your hubby talk about this subject...One of the best things about my husband's and my sexual relationship is that we feel free to communicate about every aspect of it. We never feel inhibited, and consequently, have great sex! As for oral sex specifically, I must say that it is the most wonderful feeling in the world. I have never acheived orgasm from actual penetration alone...And I always have the best (even multiple) orgasms from oral sex. Try it, you'll like it!
As far ar your cramping and discomfort goes, I would recommend seeing your physician, just to rule anything medical out. And lubricant is a good idea...Also...Condoms suck, i'm allergic to the spermacide they sometimes have in them, and have been really ouchy after using them in the past. Good luck!