[Natsu]

I use something called a Tushy. It's purely mechanical. Downside is it's not heated, but that's proven fine for me. Took me about 15 minutes to install and I'm no plumber. No leaks, though I did have to check for them during install and tighten things a bit to get it right.

[kepler1]

Oh, interesting, but too bad -- the heated water makes such a nice difference (hah).

[nawitus]

You can buy a faucet that has a bidet connected to the mixer.