Kezdők és haladók kedzere translates as Beginners and Experts, and this erotic alphabet is one of the few Székely portfolios which appears to have been printed as a limited edition, though only two copies are known definitively to exist, so it is possible that he made the series for one client and another liked it enough for Székely to make another copy.
The copulating characters are neatly drawn with Székely’s usual brand of humour and variety.
Of the standard 26 letters in the English alphabet, Hungarian uses 22; Q, W, X and Y are used only in words of foreign origin. This helps explain why the W is missing!
Of the many erotic alphabets produced in the last century, only a couple are really worth artistic consideration, mostly because they are the ones which were produced by artists. This is one of them; the other is Pascin’s Abécédaire des filles et de l’enfant chéri (A Primer for Girls and for the Beloved Child), which you can see here.