Well, a "naughty DVD", IS DVD-R, whether it says so or not. In fact, most commercially produced DVDs have either pits or bumps, (I'm not sure which), instead of burned spots in the dye layer of a home made DVD. The term, "DVD-Video", actually refers to the manner of encoding..
So, the only thing you can do with your, "sexual misbehaviour instructional video", is to put black tape patches on your TV or monitor, to censor out the "naughtiest bits" of the film. A few seconds in the microwave will, "reformat it", in a manner of speaking, but recording on the disc will no longer be possible.
Addendumb: There is a proliferation of DVD ripping software available. You might rip it to your HDD, then burn it to a DVD-RW disc. With DVD-RW, you'll be able to reformat it over and over again, whenever you feel the need, or are simply so moved.
Biblical solutions are always so self destructive, and hence, I cannot recommend them.. For example, "if thine eye offends thee, pluck it out", seems a bit harsh, when one might simply change the channel or push the "stop" button..