I think the flirtatiousness is part of the grandiosity seen in hypomania and mania. The hypersexuality is just that: you think about sex a lot and have very strong, almost irresistable urges to satisfy your desire. I've actually walked down the hallways at work feeling like a bundle of sexual energy and had to go into the bathroom to relieve it---sometimes several times a day! I never have cheated on my husband, I prefer to take care of matters myself because I have no wish to hurt him or endanger our 35-year marriage. But sometimes it's really hard to contain those appetites.....