I date a Sig Ep. And I have been around their house for the past 3 years. I love them dearly, they are definatly the "crem de la crem" (sp?) They used to choose a sweetheart every year, but as more girls became close the the brothers they didn't want to hurt anyone's feelings. They didn't want one girl to become upset because she felt like she wasn't "good enough" to be a sweetheart. In regards to pinning...I'm not sure what that is so I can't say anything about it. But we do "drop" girls. After a brother has been dating a girl long enough to have a serious relationship, he buys her a lavalier and presents it to her (he drops the necklace on her...get it??). It's used as a symbol of how serious and strong your relationship is.
