http://www.iub.edu/tour/cmps4.shtml
"A more recent legend, according to the IU archives, is that any couple that kisses underneath the Rose Well House gazebo is bound to be married. This legend stems from a Beta Theta Pi fraternity tradition. Fraternity members used to pin their girlfriends or propose underneath the dome.
The romantic tradition of kissing at the Rose Well House, which was built in 1908 to represent the Beta pin, is highly anticipated on Valentine's Day as couples line up outside for that inevitable kiss."