Hate to break it to you, gentlemen, but the numbers don't lie... Volvo's S40 sedan was the #1 car for proportion of female buyers (57.9%) in 2011. Yeah, I know this is breaking news, lol. I believe it's ranking was still top 10 for some of the other years, but I dunno.
How does this affect you?
For myself, I never thought of the S40 as a woman's car, but I never thought about the S40 until I found one for sale anyway.