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By Tracey Cox for MailOnline. It seems that men aren't the only ones with a threesome fantasy. New findings from the Journal of Sex Research found the two categories of porn that both men and women like watching is threesomes and oral sex. Threesomes consistently top the 'fantasies I'd most like to take through to reality' list for both sexes. But there's an enormous difference between watching one online and having one in reality. Scroll down for video. Threesomes consistently top the 'fantasies I'd most like to take through to reality' list for both sexes but, as Tracey Cox reveals, they're most likely to have negative effects on your relationship long-term.