Rather than being scary, the idea of getting it on with a stranger is extremely common among women, because it allows us to be uninhibited. If you’re in a long-term relationship or just seeing someone seriously, the romance and ~sexiness~ of the relationship can drain a little once you become familiar with each other’s bathroom routines and how they look when they’re sick. The fantasy of doing the dirty with an unknown person strips all that away and leaves two people who just want to get down to business!
Being uninhibited is a major necessity for a lot of ladies in order to feel comfortable enough to fully enjoy themselves – a huge requirement for success. Self-consciousness and insecurity can definitely dampen the mood, but with a stranger, we don’t face the same (perceived) judgment, and that can be a definite turn-on. While that doesn’t mean we want to be taken advantage of by some random, the fact that it exists in our fantasies offers a perfect opportunity for escape.