RESEARCH DIGEST - May 31 - Couples have sex 1 or 2 times a week, but ~half of sexual advances go unfulfilled. While having an advance accepted leaves partners feeling more content, this effect may be short-lived compared to the dissatisfaction of being rejected. 115 heterosexual couples age 19 to 64 kept sex diaries for 3 weeks about sexual advances and answered questions such as "How good is your relationship compared to most?" Changes in sexual satisfaction could still be detected days after advances were made. The team found that the boost in satisfaction from having an advance accepted persisted for 24 hours, with the slump of being rejected lasting twice as long. The gratification that came from being either an acceptor or a rejecter lasted a remarkable 72 hours.