she easily flips from side to side in bed next to me -- several times a night, little wiggle worm that she is.
she learned to sit by herself at just under 6 months & occasionally rocks on all 4s in preparation for crawling but still seems a long way from being able to crawl.
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My boy is 7 months, so I'm not quite at your stage yet, but he doesn't roll from belly to back either. He tends to get up on hands and knees and then cry because he doesn't know where to go from there. :-) I wouldn't worry too much about it.
My DD1 was very slow developmentally. She rolled over only a few times before a year, never crawled, wouldn't put weight on her legs, etc. At 14 months I decided to pursue physical therapy, and she finally walked at 19 months. She's 4 now and you couldn't even tell she was slow to do all these things. She is a monkey on the playground and continues to challenge herself. Some kids just develop slower than others.
My pediatrician was very worried about her lack of rolling over and crawling, but I'm glad I waited until she was past her first birthday to pursue anything.
I thought this article by Mayim Bialik was a helpful perspective on not rushing to physical therapy. It made me feel better about my own decision to wait, even if we did eventually go that route: http://www.today.com/moms/why-i-dont-force-my-kids-say-please-or-walk-1C7398514
Mom to two little girls... wonderfully 4 years and delightfully 1.5 years
Passionate about birth... GeorgiaMomsforBetterBirth.com
Neither of my kids seem to be interested in gross motor stuff, and are content to lie around/sit forever. It's actually nice--I figure their brains will develop a bit, and they'll be more cautious when they can finally move around well.
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From what I seem to hear from the medical community, straying from the "average" rarely means anything other than the baby has a different pace of development. Keep your health care provider informed, but otherwise I wouldn't worry too much.