It's incredibly difficult to pick just one... so I won't. Just to note, I wholeheartedly agree with everyone's suggestions so far, but I'm deliberately gonna try to pick things of a slightly different tone/style to what's already been posted rather than posting more similar stuff.

[hider=In This Moment]If you only listen to one, make it the acoustic version of Blood. Adrenalise is great too. But as about half this band's songs are sexual/sensual in some way...
[youtube]dXMfdpjnAHU[/youtube]
[youtube]SbH5NeiFGjY[/youtube]
[youtube]5TXmOwTALOY[/youtube]
[youtube]tbei-_MNe30[/youtube][/hider]

[hider=a bunch of others]
[youtube]VLTKbk2gB-I[/youtube]

By itself, the song is sultry enough, but I chose it mainly because of the combination with awesome choreography. Credit goes to Taaj for showing it to me a couple years back.
[youtube]w-UgYFVFucc[/youtube]

[youtube]Hk9-qH5fyTU[/youtube]

[youtube]K-7FWQpZE0E[/youtube]

That should do.
This is just what I can come up with off the top of my head - I accidentally formatted my SD card and lost 3-4 years worth of music the other day, along with all my pictures and stuff from that time. I almost wept.

EDIT:
[youtube]_bw1uye8aOI[/youtube]
[youtube]JGb5IweiYG8[/youtube][/hider]