Question: How do you fix the hapless Cleveland Cavaliers?

Answer: Porn star gang bang.

At least, that's the solution hardcore adult actress Ava Devine offered up in NYC the other day ... in fact, she's such a big Cavs fan, she's willing to take one (or 5) for the team.

"If [the Cav's] make the playoffs ... I will bang them all and bring a girlfriend," Devine said.

She also wanted us to know, "I can handle them all by myself."