“Pleasure” here means joy; gratification means amusement and ease. It means that the adulterer and adulteress rejoice in their adulterous trysts, thinking only of immediate comfort, giving no thought to the ruin that shall follow.
They are beset by misfortune and setbacks for half their lives, unaware of the ruin awaiting their descendants.
Those addicted to licentiousness often end in utter ruin and dishonor. Their own lives are dogged by hardship for half their days, and after their death, their descendants shall see their household crumble and perish.
Either their family line is cut off without heirs, or their offspring are reduced to beggars.
Descendants keep the ancestral incense burning; to have no children is to sever the ancestral offering line. To beg for food and alms is to live as a beggar. Even if lecherous men leave behind progeny, those descendants may well be reduced to begging.
Either their own wives and daughters pay the karmic debt through suffering, or their heirs fall into destitution and misfortune.
It is said that for a man given to lust, his own wives and daughters shall repay his karmic debt of lechery, suffering violation at the hands of others. Falling into destitution and misfortune means fallen fortunes, universal misfortune, and utter wretchedness of spirit.
Wandering ghosts in lonely graves, who shall burn paper money for you?!
When one dies, one becomes a ghost; earth heaped up makes a grave. Should one given to lechery die in a strange land and be buried among desolate hills, he becomes a lonely‑graved wandering ghost. No one burns paper offerings for him.
Reckless dissolute youths, who will set forth sacrificial food for them?!