Sometimes we really don' t need research to tell us the obvious!And on this one three Universities participated!  Men who drive Porches and other expensive cars have one thing on their mind, and it's not marriage. They just want sex. Here's a tip for women everywhere: Men's conspicuous spending is often driven by the desire to have uncommitted romantic flings. That's the word from researchers at Rice University, the University of Texas-San Antonio and the University of Minnesota, who concluded that while a man's flashy spending and shiny sports car may get a woman's attention, she won't be showing off an engagement ring anytime soon.