Mary | Mycroft
Men who are single are usual so for good reason. Which I realize may sound hypocritical coming from me, but I'd be the first to admit that I'd make a terrible partner.
You have the sexual revolution to thank for that. As for pansexuals, you'd have to ask one. But I'd hazard to say that each individual will have their own answer. But, I assume, that a pansexual may not mind if their partner is male, female, or transgender, but still be choosey and have personal preferences as to specific characteristics, for example, hair color, age, height, and so on.