I struggled with this for years. Just to lay there out of touch with reality and consumed with the pleasure of a prostate massage.
The best thing I have found is the following:
https://www.extremerestraints.com/el...plugs_584.html
Power it with this:
http://www.zeuselectrosex.com/ac126.php
Choose the size that "fits" you, but I will say that you will probably end up retrieving the smaller one with the wire.
Now before you freak out, this works like a TENS on your back. You feel no electrical shock, it just stimulates the muscles that it is in contact with. There are three settings that either thump or pulse or a combination. I have found that gradually increasing the level of intensity increases the pleasure. Another point, these are made of rigid plastic and the contacts are metal. After I felt uncomfortable with the cleanliness of the first one I had, I purchased a second and sealed it with silicone. Worked like a charm. Hit the sweet spot here and it will actually produce a hands free orgasm.
PS...do not be fooled by the fact that it is only powered by 2 AA batteries. If you hold it in your hand and turn it on high, I promise you'll go WTF there is no way I putting that up my ass, but trust me, start low and work up. You will be in bliss.