If you haven't used an STP before I'd start with a Pstyle. Pretty much fool proof. I maybe alone in having a couple difficulties with it very initially (or maybe not since they tell you to practice in the shower).
The down side is that it is HUGE. I am thinking that at some point I might try and make it easier to carry in a coat pocket by cutting it a little bit. It isn't really comfortable as it is hard plastic but that's what makes it so easy.
I got the clear. Even though it is hard to carry, NO ONE would ever guess what the thing is.
I'd love to try this with cis--- non camper friends.
You can get it on Amazon for something like $12 with shipping.
It's not the *best* stp. It's the easiest.
BTW, there are glow in the dark fenis and mr fenis.

I can tell darth Taco is better at this than I am, as he can do this at all when drunk.

--Jay