Her Mars on his Ascendant is definitely an issue..she likely wants to be in charge of the relationship, although with Mars being In Cancer, it's possible she's somewhat subtle or passive aggressive about it. Her Venus is in detriment (weakest expression) in Aries; his Venus is in Aquarius..they likely have trouble with love expression toward one another. He also has Pluto, Saturn and Mars in his 5th house of sex and romance, which can make him mean, controlling and possibly kinky.