"Self Fucking" and Anal Contractions

Hello All!

Long time following the many interesting threads in this Forum, first time poster though.

First off, I would like to acknowledge how great this journey has been and that the Wiki and also Forum has played an  integral part in my exploration, so - Thank you!

As for my question: I recently found a video and the intro describes the process of lubing up the thighs plenty and then tucking ones Penis and Balls between the thighs and "Self Fucking" while engaging in Anal Contractions.

I tried it two nights ago and it felt very different and nice. Especially in my Balls.. The pleasure lasted for quite a while, before I got really tired and fell asleep. The next day my low back felt kinda free and was also aching a bit, so I must have been thrusting quite a bit, all while "fucking myself".

There are most likely a few of you that have experimented with this, so maybe you want to share your experiences, tipps and tricks?! 

Also naturally I've thought about using an Aneros while engaging in this technique, are there any recommendations what model would be best? I have the Helix Syn and Program.