I just went through the thread on Mars being in Scorpio as being one of the sexiest placements for a man and it got me wondering.....what about Aries? Mars is the ruler of Aries and both Mars and Aries are gods of war. You can't get much more masculine than war xD From an astrological point of view Mars in Scorpio confuses me.....because Scorpio is a water sign. Mars is not comfortable in the other water signs yet he co-rules Scorpio? I think that a guy with Mars in Scorpio would be a very sexually driven person who has good sex appeal and a guy with Mars in Aries would have very strong masculine features, which may or may not be a source of sex appeal. Anyways....thoughts?
Mars in Capricorn, first pick.
Mars in Aries, second pick. 
Alpha male, basically.
Oh a new contender? I never thought about Mars in Capricorn. That placement strikes me as a guy who knows his business and gets shit done. It makes me think of a guy in a suit and tie.
Mars is exalted in Capricorn.
I like Mars in Capricorn a lot. I've dated men with that placement. Venus in Gemini and I do not mix romantically.
A man I knew with Mars in Aquarius was way too hyper for me to be comfortable around but he was highly successful and whip smart.