Its not catabolic, it doesn't have any effect on anything besides making you tired which is your body wanting sleep to counter the good feeling. Homeostasis is what causes this. Right after an orgasm, dopamine, which is the brains pleasure neurotransmitter, is released at its highest degree which causes the great feeling of ejaculating. Your body needs to balance this feeling out by making you more tired and somewhat depressed depending on the situation. Its just like drugs, cocaine acts as dopamine to artificially release it into the body, causing a sudden great rush of feelings. The body then needs to stabilize this feeling through homeostasis by making you feel like complete ****.
In short, the natural release of dopamine (quenching thirst, eating, cumming) is beneficial to your health. Not saying jerk it all day long, but its very healthy and expected to have an orgasm at least once a day.