You mean RPG porn games where losing results in a submissive sex scene? Yeah, there's several. Corruption of Champions, Corruption of Champions 2, Trials in Tainted Space, Lustful Desires, Tavern of Spear, Summoned By Accident, Lilith's Throne, Flexible Survival, and Love Monsters and Order are all the ones I know of. Most of them don't have that lead to a game-over (except in certain circumstances, like losing to a major villain or losing to the same enemy multiple times in a row), but they normally do punish you in other ways, such as you losing items or money or just not getting any of the rewards and xp you would get from winning the fight.
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Not many that I'm aware of. I vaguely remember a really janky 2.5d platformer that did that, but I'm hardly an expert on porn games.
When I said that "a lot of these games make the same mistake," I was just referring to the fact that losing the fights is both how you access the sex scenes and is punished by the game's mechanics. Though I have come around to that design philosophy at this point, even though it does sound completely nonsensical if you examine it through the lens of traditional game design.
It definitely is completely nonsensical. Not something I can over come around to. Even if it were commonplace, I'd still say it's a common mistake, not a good design.
Not saying no one can enjoy the game, but I stand by my statement that the people who enjoy this game are enjoying it because it's an RPG and no other reason.