Are we born bisexual Scientist claims most of us are BISEXUAL just like our primate relatives in the jungleMore and more people say they are bisexual meaning they're sexually attracted to both men and women. According to the most recent official stats, , UK people 16 or over ( per cent of the population) identify as bisexual up from , ( per cent) in However, the true number of people having both same-sex and opposite-sex encounters is actually much higher, a scientist suggests.