It can be positive or negative depending on your view.
'Sexually it was crazy. That's all I'll say. It was like napalm, sexual napalm. Did you ever say, "I want to quit my life and just f**king snort you?"'- John Mayer
"I know she is not that pretty in the face, but she's like sexual napalm man, I can't shake her." - Some random dude.
2. What Tiger Woods wishes his wife was.
3. A hot tasty biaatch who is insatiable in the sack.
Dude 1: "Dude, I've been working out at the gym, taking Viagra, eating right; you know, like eating my veggies and stuff. But I still can't keep up with her.
Dude 2: "Dude, she must be like what you call sexual napalm!"
Dude 1: "Dude, I'm like gonna give her Tiger Woods' number"