1978 playboy isn't even close to porn. The most risqué thing on it is the girl in the pool/grotto on the left side of the PF. The only issue I see are the "prudes" who will see the name and instantly think porn, and not even look at it to see its not. And in the 70's skin wasn't so much of an issue, there were flashes of it in PG movies, not sex, but flashes of skin. Then the moral majority got in and started pushing that skin is bad, so now you see more people getting blown up, and all sorts of violence, but show any skin... One of the big differences between here and many other parts of the world. When it first came out, it was everywhere. Again, my 2 cents...
I also disagree with the poster above that said his kids are to young and he will have to wait until they are 18. We aren't talking about the later ones, although even they can be toned down. But you have to do what you feel is correct.

You are correct, I missed those, but I don't know if I would call them ladies, per se. They aren't really any different then some of the things on other games of that era and some later. Look at Nitro Groundshaker, I would call the girl on the PF on that "worse" than what's on here. And I'm not saying that the OP should or shouldn't place it, just that if you look at the game, its not any worse or less family friendly than a lot of other games. Just the name, which for a lot of people, who probably don't know, makes them think porn. They think there is hardcore porn in playboy.