Unlike most adult IF, Softporn Adventure has actual puzzles and gameplay outside of simple seduction. Given the era, it's not surprising that the puzzles are simple and shallow and the prose is flat.
But no one talks about this game to talk about it. There's the sleazy and unpleasant story behind the game's cover. There are the bizarre and illogical puzzles. And, of course, this game would later be reworked into Leisure Suit Larry, and the irony that there's actually a worse version of Leisure Suit Larry.
In a strange way I kind of wish this had been a Hi-Res Adventure like The Wizard and the Princess or Mission Asteroid. Not because it would be hotter with pictures (nothing could make this material erotic) but because I have a morbid interest in seeing how this game would look in that "crude even for the Apple ][+" style.
Anyway, as a game, Softporn Adventure alternates between simple, boring puzzles and parser-wrestling nightmares. It doesn't have much to offer even for its era.