Alright, let's get one thing straight... If he's getting dates etc. then the issue is definitely
NOT his looks! If that were the case, then they wouldn't date him in the first place.
It's more likely, as they say, you're not connecting with them. Do you know how to talk to girls? When on dates, do you listen to whatever cr*p she's rabbiting on about and build on it... or are you thinking about what she looks like naked? Do you compliment her when you see her? Maybe she caught you looking down her cleavage too many times (a couple of discrete glances is OK, but if you're doing it all the time, she'll dismiss you along with every other creepy purvey guy she's had to put up with). On the other hand, if you play it too safe (e.g. no flirting, complements, limited body contact etc.) then she'll think you're not attracted to her.
What's contact like in between dates? Do you respond to her texts? Do you take too long to respond or do you bombard her with love notes? What are your social media posts like? Maybe they're being honest about their reasons?
Truth is, it could be many reasons, and I'm not saying it's any of the above... but I'm giving you a few things to think about
They are desperate?
Don't you mean he is coming across as desperate /needy? If they were desperate, then they would put up with bad dates just so they could have a man in their life, no?