lascivious

I think, it can be ,depending on a situation, such as descripton of a rapist

Does it have negative connotation?

Yes, indeed!

From Mac Dictionary:
(Of a person, manner or gesture) feeling or revealing an overt and often offensive sexual desire.

Antonija, absolutely yes, it can be. And it does not need to be offensive, just driven by ****.
Kajjo

I agree it's not negative, but perhaps the lasciviously can be applied to the act of laughing, rather than lascivious used an adjective to describe the laughter itself.

The wife waggled her eyebrows and her husband laughed lasciviously, rather than gave a lascivous laugh. The laugh itself won't sound that different, will it?

In Paradise Lost, Adam "on Eve/Began to cast lascivious eyes", shortly after the bit with the apple.

But as with "lustful", much depends on the context. If you were working late with a particularly appealing colleague, and she perched on your desk and "laughed lasciviously", you might find it quite a positive phenomenon. (On the other hand, if she wasn't that appealing, you

I see... Thank you