Its very common today and a fastly growing sex play genre overall.
Sadly enough however females are not keeping pace with the current fem reniasance that is underway so this means the end product (literally) is much more than the suppliers of that product.
Its also of note that today, scores of males who once would have been relegated as gay are now finding life simply as = ANAL CENTRIC which creates a dividing line and a distiction between a sex play item vs a physical and emotional lifestyle.
I personally think at least half of all males are anal centric whether for prostate stimulation (or therapy), or simply for just anal sex pleasure/s.
There are more nerve endings inside the rectum than are present in a penis head or female clitoris. This can and does make things like pegging very desirable.