Dave Navarro -- I'm Strapped for Kinky Sex

Dave Navarro can go from shredding to bedding in one fell swoop ... now that he's designed a two-in-one guitar strap slash sex toy.

The rocker tells TMZ he decided to combine his 2 favorite things -- music and sex -- and teamed up with a BDSM toy company ... and the result is something he calls, "The Strap."

Pretty simple concept ... the guitar strap comes off the guitar and can then be used to restrain yourself or a partner in a ton of different positions. Seriously ... just about anything your sick mind can come up with ... The Strap can handle it.

As Dave put it ... "It's the Swiss army knife of the bedroom" -- that is if you don't already have an actual Swiss army knife in play.

Navarro preaches safe S&M though, and revealed his safe word -- “Chappaquiddick.”