Studies show that rich men not only have more sex than poor men, but their sexual partners are way hotter. What should we make of these findings?

“Love is a temporary madness, it erupts like volcanoes and then subsides. And when it subsides, you have to make a decision. You have to work out whether your roots have so entwined together that it is inconceivable that you should ever part. Because this is what love is. Love is not breathlessness, it is not excitement, it is not the promulgation of promises of eternal passion, it is not the desire to mate every second minute of the day, it is not lying awake at night imagining that he is kissing every cranny of your body. No, don’t blush, I am telling you some truths. That is just being “in love”, which any fool can do. Love itself is what is left over when being in love has burned away, and this is both an art and a fortunate accident.” 
― Louis de Bernières, Captain Corelli’s Mandolin 

The ability to nurture and provide the other with security and peace of mind is not merely a function of Monetary wealth. Monetary wealth in many respects may well denote an absence of the required qualities to be a participating and contributing partner to a relationship both sexual and platonic. I agree with you that the OP was rather thin on offering any sort of evidence offering perhaps a memetic banality of the Pea Cock variety ( Pea Cocks get a mention elsewhere in the thread). 
My personal experiences are not modern and worrying about whether or not I am going to ´´get laid´´ passed in my long since passed teenaged years. In Sweden there is a saying. 
´´Big Car Small Dick´´My Father In Law once ryely intimated this folk wisdom to me at the Local Gas Station as a Sunglassed paragon of Stockholm style was donning the little plastic gloves to charge the Tank of a very shiny and very large motor car. It was very dark and around midnight, the moon was not shining bright enough for the sunglasses to have any practical effect. I think my Father in law assessing the scene felt sufficient evidence existed that in the case of this Rakish Gent the small humorous generalisation was warranted. 
I do not recall the occupancy of the passenger seat at the Scene and can not attest to the prowess, regularity or indeed quality of the ´Other´´said Rake may or may not have been enjoying with that nights or any other partner or indeed of what sex they may have been. 

To be crude, If it is true that Birds of Feather Fuck as well as fly together. I might venture that the idea of attracting opposites is not operating in the studies that Donald had in mind with his indexed Meme. I might add my Father in law may have been having a little dig at me at the time a Rolls Royce and Bentley were snuggled in the Garage of my English Estate amongst other automotive ego props acquired following my divorce. This Kinks Classic is a great song, As the first person narrating the song is sat there with his Ice Cold Beer Sans Yacht and Car perhaps, Ray Davis is describing a form of State contraception enforced through her majesties revenue and customs.