It raises questions about the relationship (if any) between love and sex, issues of fidelity to someone's memory at conflict with natural needs...shit, you just asked one hell of a question.
I would say, by way of an answer, that it's way to early to enter into any meaningful relationship. I don't think you're ready for that by any means and leading someone on would be wrong. Meaningless flings, however - sure. The less meaningful the better at this point.
I know there are women who would happily throw me a sympathy fuck. Would that make me disloyal? My wife would say yes if she had a vote. So should I be satisfied with five finger Mary? I don't know. That's why I'm asking.
*MySmiley*
"Bustin' makes me feel good!"
Ghostbusters, by Ray Parker Jr.