As it happens, lying in bed with your boyfriend and eating cheese all winter may actually improve his sexual stamina. Who knew? According to a new study, overweight men are less prone to premature ejaculation and, thanks to a higher level of estradiol (a female hormone that delays climax), big dudes also tend to last longer in the sack--7.3. minutes, to be exact. Which puts the average timestamp on a slimmer man\'s sexual duration--a measly 103 seconds--to shame. But obviously this doesn\'t mean you should encourage a three-meal fast food binge for your man. Being overweight, which is clinically defined as having a BMI (body mass index) of 26.4 and up for men, can lead to tons of other health problems, some of which affect sex drive and even blood flow to the genitals. London - Glamour