As porn-star Sean Xavier demonstrates above, the act of rimming or widely known as analingus is the act of orally pleasing the anus (entrance to the anal cavity). The stimulation offered is more than likely from the tongue, lips and mouth in order to relax the partner's sphincter muscles that expand to permit the insertion of the erect penis for sexual engagement.
Rimming or analingus is not an exclusive sexual practice between same gender loving (bisexual or gay) men. It is also enjoyed and practiced by heterosexuals as well. Many people do incorrectly believe it to be an activity enjoyed only by queer (gay or bisexual) men.
A blindfold isn't necessary for rimming. It is merely an accessory used by the bottom-man in this scenario solely for entertainment.
Above, the bottom-man indicates his willingness to have his ass/buttocks serviced to relax him before he is to be fucked.
As he's wearing a blindfold (again, not a requirement), he hears someone approaches and orally encourages his top-man to come to him.
His top-man enters and surveys the scene on the bed. Perhaps this is their first sexual encounter together.
Our top-man begins to make his presence and his needs known to our receptive and willing bottom-man. They commence their engagement foreplay. All attention given to our bottom-man's anatomy is most welcome!
The use of the hands in this foreplay is often misunderstood. It isn't an element of rimming, as that is limited to simply oral stimulation. The use of the hands (slapping) or fingers is better known as manual stimulation.
Using his thumb, the top-man begins massaging/stimulating his bottom-man's buttocks crevice and his anal entrance.
The above shows us the use of the mouth and tongue in caressing the back of the bottom-man. Keep in mind that these caresses may help him relax but it still is not analingus or rimming.
The oral attention offered to the bottom-man's ass/buttocks is most definitely analingus or rimming. It is the stimulation given below that helps to "open-up" or relax the anal cavity. The top-man renders this service in order for his erection to ease into his bottom-man for the ultimate delight of them both!
A man's tongue titillates the anal lip (opening) of a bottom-man's ass as that action alone sends the thrill throughout his body! This thrilling sensation greatly helps the bottom-man to relax his sphincter muscle which in turn significantly reduces the risk of pain and allows to top-man to comfortably insert his erect cock into the bottom-man's ass!
Versatility matters, guys! Be cool!
Rashad Keith Cuffee