Nothing like the prostate! Whehoooooo! But don't neglect the anus it is a really fun area too. And if you get a little deeper there is the amazing feeling of the second sphincter that is also amazing.

There are devices especially for prostate masage...."Aneros" I think they are called. Come in different sizes depending on how experienced you are. I would suggest beginning with something a little bigger than the smallest one....kind of a waste of time I think.

In the drug store they sell small blue rubber "ear flushing" bulbs. Little things you fill with water to wash out your ears. They are perfect for giving your ass a gentle rinse. Just enough water to get rid of the last pesky bits. You might have to do it several times in a row to get reasonably clean. This works mostly with just your rectum as it does not hold a lot of water, but it does the trick in a simple way, is uncomplicated and quick. Narrow neck is easy to insert. Make sure the water is "balls warm" meaning that it feels good when squirted on your balls. This is a good way to test the temperature. If it feels good against your balls it will be ok in your ass. Won't lead to cramps etc.

Also, coupled with all the sensations of a good prostate massage is the gentle stretching of the anus itself. This can be a really great feeling too.