For many men curious about the sensations of prostate stimulation but put off by the somewhat messy and involved process of internal massage techniques, it's possible to get a hint of the sensations produced, by sitting on a tennis ball on one of those office chairs with the stretchy mesh seat and rolling the tennis ball over the perineum.
It's important not to apply too much pressure for too long to this area as it may bruise the nerves, but for a short duration trial, you may start to get unusual internal sensations that later become interpreted as pleasurable sensations accompanying further internal prostate stimulation. At least it provides a hint of the sensations possible without a lot of fuss.
Good luck in getting stimulated (sic) enough to consider going further with internal prostate massage: there's nothing gay about it.