There is also a Niche category of porn called Clothed Female, Nude male — or CFNM.

A quick search on XVideos for CFNM returns over 55,000 results, while the CMNF search barely returns 1,500. A google search for CFNM returns 129,000,000 results while CMNF returns only 3,800,000 results.

Not sure what bridge you were trying to gap by bringing up CMNF porn in the first place, but you have to acknowledge that it is not a very popular category of porn, especially when comparing it to its polar opposite.