Want to see which girls are checking you out? Click on the "profile views" tab on The Girls page and you'll see all of your female admirers and the date they last viewed your profile.
It's up to you if you want to show the girls you've viewed them. If you want to browse girls in stealth mode, simply click on the "edit profile" tab on your Home page. Under My Account click the No bubble next to Profile Views. Don't forget to click Save Changes.