I commenced practicing DATO about 3 years ago with a TOS girl who became my gf for about a year after we initially met. I abso-fucking-lutely loved doing DATO on her and she loved every minute of it and we even video-taped a lot of those. Ever since then I've DATO-ed quite a few girls. Why I prefer DATO I really don't know/can't explain but I am not much into DATY. Only do it when the girl desires it and it pleases her. What about you guys?
Disclaimer: No dudes have ever been DATO-ed by me, nor have they DATO-ed me. Fat chance of that ever happening.