[pacerier]

cool, just to check, if i were to say something along the lines of "Bob has a foul mouth", are both of these acceptable: ボブは口汚い / ボブは口が汚い

if みだら is written in kanji, will it be 淫ら or 猥ら, or is it that actually we do not write it in kanji?
(will the 心 in みだらな心 pronounced as しん or こころ?)

Also, other than using 必勝法 as “sure-win method” for games, can we use it in the context of competitions / battles / wars etc? E.g. この試合、必勝法があります