I've never really played any adult games on the psp, I prefer to play games like persona, ys & sora no kiseki but there were some adult games that had english translations for the psp there's
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...?? it's a myster horror but there is sex content. errr there was a translation project for boku wa tomodachi sakunai portable not an adult game (no sexual content) but I think thats abandoned now, there's oreimo but again no sex.... I can't think of any others but there are probably more especially if you don't really care about sexual content and just want the dating sim aspect.