lobster helmet
The sexual act of having your partner stay in the sun for an extended period of time, making sure they receive sun burn. Then, your partner sits on your face or head, sandwiching a full stick of butter between you and them while the heat of the sunburned skin melts the butter all over you.
After a romantic day at the beach, he pulled out a stick of butter and suggested I give him a nice"Lobster Helmet".