I'm not necessarily referring to the games themselves, which often do operate under the "sex sells" principle. This is about the advertising; which is the expected marketing approach for say, automobile advertising. Hot models straddling muscle cars is to be expected.... but not so much with Q-Bert and Pong.
Of course, what wasn't marketed with a pinch of sex back then? I don't mean raunch, I mean the good old fashioned technique of putting a pretty lady beside your product. Your brain associates the two together, and, bingo, your product magically has a positive feeling behind it for potential buyers.
Draw Poker (1983)
Please note that you can view all of these images and more at The Arcade Flyer Archive. Much cred goes to this great resource. Also, click on the thumbnails for the full uncropped image.
Astro Fighter (1980) Data East/Sega
Head On 2 and Deep Scan (1979) Sega
Gotcha (1973) - Atari's fourth game. It caused a bit of a stir due to its boob-like controllers.
Gran Trak 10 (1974) - An Atari racing game - the first to feature a steering wheel and gear shift. An accounting error had Gran Trak 10 selling for $995, when it cost $1095 to manufacture. Because of these problems, Atari lost $500,000 on Gran Trak 10, which was as much as the company had made the previous year.
Space Race (1973) - Atari's second video game (Pong is famously their first). Object - drive your little rocket ship to the top of the screen without getting destroyed.
Fonz (1976) - The goal was to drive your motorcycle across the road, while avoiding oncoming traffic. The game is important because it was among the first to introduce haptic feedback - the handlebars vibrated when you collided with another vehicle.
Turbo (1981) Sega
Konami GT (1985)
WEC Le Mans (1986)
Shark Attack (1980) - The first video game to have quadraphonic sound
Wham Bam (1974)
Haunted Castle (1988) - the first arcade game in the Castlevania series
Missing in Action (1989) - Watch out, lady! Those fellas look a little rapey.
Jungle King (1982)
Strike Zone (1988)
Monaco GP (1979) Sega
Just place the rum and coke on the side, and bring back a fresh ashtray, wouldya, honey?