Kissing in a Boxster

[herve_g]

Seat time should be reserved for track practice

[jdraupp]

Better make sure she's single or this boxster will also be meeting an untimely end in a parking lot.

[BrokenLinkage]

The how part, well the added challenge of the boxster just adds to the fun, you'll enjoy having to figure it out for yourself. But if she takes too long fumbling for the seatbelt, that is your cue to reach over and help her get it. From that point, I think nature will enhance your creativity.
Meanwhile, if you expect a really great date, take the windscreens out, and lay a towel over her perforated leather seat...