Researchers wrote, "Because straight women’s relationships with straight men and other straight women are often tainted by deceptive motives related to mating interest or competition, respectively, we predicted that straight women would perceive mating-relevant information provided by a gay male to be more trustworthy than similar advice provided by a straight male or straight female." It's easier to trust a gay man with relationship advice than one of your girlfriends – they may be competing for the same man. And it's not as easy to discuss relationship matters with a straight man because of the potential for sexual tension among the two of you. The same is true for your gay BFF – the sexual interest and competition aren't present in his relationship with you, so he can trust you to give him sound relationship advice.