Prior to intercourse, prepare a bag of neatly trimmed and/or shaven pubic hair and leave in the posession of a trusted accomplice. Have said accomplice hide in closet (with bag of pubic hair at ready.) Invite a lady friend and proceed to commit hideous sexual acts (e.g. rusty trombone). Following ejaculation upon facial region, have accomplice promptly emerge from closet and disperse pubic hair over ejaculate-covered area. In chorus, shout "Wolverine!". Bask in the glory of your successfully executed Wolverine Surprise.
"Oh dear chap, you would have applauded the Wolverine Surprise Archibald and I administered upon Gertrude yester-night"