Some of us have spent countless nights with other kids locked in the basement during parents' swinger parties and/or been there and done it ourselves as adults and found it to be as much an empty experience as the parent poster suggests. Molestation victims also frequently report the same sentiment. Removing love from the equation turns the act of sex into mechanical fluid exchange, and the participants into human livestock.
Promiscuous people are as annoying as those who refuse to eat at the same restaurant twice. You have an insatiable appetite for novelty that you need to see normalized in others-- to defer ever having to face the very emptiness we're describing.
If you actually found it fulfilling, you wouldn't need to sell others on something that sells itself.