Dear Wenjer,

I am not too familiar with German literature, but I have read my share of Psychology works. I take that you are familiar with the works of Sigmund, or at least know his "general ideas".
Keeping this in mind, the word "Jenseits", in my opinion, indeed refers to "beyond". I do think that a better translation should be available for this purpose, but as often is the case, a book has to be made interesting enough for people to pick up (=buy!). In other words, don't worry about the exact meaning of Jenseits and/or beyond in this context................... (as long as you know that the two words in this context both refer to the underlying, or deeper, meaning in nearly all Sigmund's ideas).

And in my opinion, the word "pleasure" in the title doesn't give proper credit to Sigmund's work (and I believe is added to attract more byers); if one wants to read more "behind the lines" (about the sexual/habitual needs of people) than there actually is in the books, than you can go very far (if you know what I mean).
In this respect, the word "Lustprinzips" gives a better description than "pleasure" does, in the general meaning of Sigmund's thoughts and ideas. (But of course, the interpretation of pleasure, lust, erotic experiences, etc. and the thoughts and habits people have about this, is a very wide and subjective matter all the same...........).
And if you read several psychology works, you know by now that everyone has his or her own "speciality" or "area", I refer to Maslow, Freud, Watson, Jung. (among others).

Kind regards,

Somerset.