Lots of gay men love doing that to their lover's cum, but some would go even further and play with it like it was some kind of toy before swallowing it.
What is it about semen that attracts gay men to see, smell, taste, and even swallow it? Maybe because it's color and texture is similar to egg whites? Or could it be the salty taste that can be sweetened by consuming lots of pineapples? Whatever the reason may be, it's easy to say that gay men love getting sperm in their mouths, and most of them would even gulp it down like it was water.