What is a 'lavacious' act? Will you be casting Volcano is a sensual, lewd, lustful, or erotic manner? I suppose the standard "up the backside" Volcano tactic would be considered lewd by most folks not fond of hot lava enemas.
The word I was using, however, just for your edification, is
lascivious: it means lewd, lustful, or wanton.
Hence, a 'lascivious act.' I have seen references to "lewd and lascivious acts" on charge sheets before, which charge struck me as a repetitive redundancy.
Lascivious: from the Latin
lascivia which is 'wantonness.'
