You may or may not like skin colour. You may or may not like the cultural baggage. Or bone structure. Or ass size. But to draw a conclusion about their sexual prowess based on skin colour seems far-fetched. Like saying "you should get a red car! Red cars go faster!"
To get any sensible connection (not based on culture, physiology etc) you'd have to go down a very controversial route I think. Something like, "generations of slavery must have bred out a lot of intellectual capacity in general, or at least given it a hit, so on average they fuck more like animals."
Well done for being direct and candid in this observation Marmelade !
Controlled reproduction on the plantations for 300 years from the fittest of the fit ( especially just to survive the slave ships from Africa ) may have created hybrid humans with DNA refined to win Olympic Gold Medals but not sure that helps in the champion fucker dept
Sexual prowess is also dependant upon cultural and libertine attitudes as well as sexual confidence and possibly a touch of hedonism . Blacks and mulatas that have great reputations as supreme fucks owe more to a connection to Afro folkloric customs about sex ( i.e the opposite to Protestantism ).