While I am aware of the secondary meaning of 'heiß' as 'sexy', it seems conceivable that we could say, ,Der Mann sieht heiß aus.', if the surrounding conditions were right, i.e., it is 40+ degrees out and the man is sweating? Grammatisch gesehen ist's richtig, oder nicht?
Likewise, ,Die Frau sieht kalt aus.'
Or, is it necessary in these two cases to be roundabout and say, 'Der Mann gibt mir den Eindruck, dass es ihm heiß ist.'?