This slit, with its cover, and a vessel placed upon a shelf, Fig. I.,k, laid across strips, e e, constitute the latrine.[…] Fig. II. shows the form of the latrinal opening, and also the position of the cushions on either side of it for the seat.
Source: wiktionary
Felix always attended Venus upon her little latrinal excursions, holding her, serving her, and making much of all she did. To undo her things, lift her skirts, to wait and watch the coming, to dip a lip or finger in the royal output
Source: wiktionary
He drew a deep breath in and the smell from the morning ablutions of his neighboring slum dwellers hit his nostrils and immediately fouled his mood. The shores of the Bagmati river provided an ideal latrinal retreat for the men and women in the Basti and despite numerous protestations by him, the lure of the sandy beaches and plenty of water proved too strong a temptation for his neighbors.
Source: wiktionary
As for the verbal humour, it is normally pornographic; but it achieves the latrinal.
Source: wiktionary
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