Nope, sister, "hot" isn't naughty-sounding at all in English. It is used by youth to describe someone good-looking and "She is hot" has about as much sexual connotation as "She is pretty." Young people, however, are afraid of sounding too quaint, so they use the word "hot" to substitute for "pretty/handsome." In fact, I don't believe I have heard a teenager(besides myself) use the word "pretty" or "handsome." They always say "hot."