Snake Beater – Get caught by Otacon stimulating yourself
When MGS2 was updated for the HD era a number of saucy accolades were added, including virtual awards for luring a guard with a girlie magazine, sexting a photo of a marine with no pants on to Octacon and smooching with a pinup girl poster inside a locker. This one, however, takes things to the next level as it basically involves making a lewd phone call while in a compromising position.
While exploring the tanker as Snake, you need to head into a locker room and find one with a pin-up girl poster on the inside of the door. Then, if you enter first-person view mode and focus on the poster, your view will start bobbing up and down faster than usual, the pad slightly vibrating. No clues for guessing what's happening here. Hitting the codec button while maintaining this view connects you to Octacon, who will scold you for calling him with your sex face on. Awkward.