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Aneros and Keysound are both good paths, and I've heard they go well together.
You can do both if you want, though the main thing to learn in the beginning is patience. Another piece of advice from personal experience is that porn can desensitise you. Best used in moderation if at all!
As for pros and cons, I can call out a few.
Aneros involves insertion through the anus, so that's a skill needed. Once you get enough experience it'll be easy though, and you'll probably look forward to it.
Keysound can be practiced anywhere I suppose, but you'll probably want to make sure you're in a private place anyway since people might hear you.
I think I actually shied away from Keysound because I was worried about people hearing me. With Aneros I just lock the door and crawl into bed, then I feel safe.
@Oneironaut, welcome to the Forum.
Most of the information on this forum is focussed on the use of the Aneros hands free Prostate massager.
So while you are choosing "the path" buy an Aneros, use it. You may find that is all you want.
Hi Oneironaut,
After a lifetime of sexual experimentation, a successful utilisation of the Aneros and Peridise devices and a successful exploration of the KSMO over the years I find the latter mind-driven device-free technique to be the ultimate for me.
But there's no reason for your three possible avenues of choice to be mutually exclusive. I don't think you would cause any problems to arise by adopting Aneros and KSMO in parallel providing you don't mix them together on the same days. Both approaches are focussed upon the same area of the body.
Good luck,
Mog