You don't see gay people complaining about being uncomfortable watching heterosexual behavior. A straight male has grown up being a male, having a penis, they are use to the male body; yet some straight males are uncomfortable seeing something they themselves are(a male) kissing another of which they themselves are(another male)? Why? Maybe, a straight male doesn't get aroused or turned on by same-sex PDA, but having a "neutral" response, would make more sense. A "neutral" response is generally the response that gays have to opposite-sex PDA, so why can't straights have a "neutral" response to same-sex PDA? You have to wonder, if someone who claims that same-sex PDA is digusting, if the act really is disgusting or if they just tell themselves that it is disgusting? I would think a gay male would be more turned off by women's "parts", than a straight male would be at other male's parts.