Speaking from experience.

If you aren't comfortable with it at any time, YOU CAN STOP. It doesn't matter if you are all naked and ready, it doesn't matter if you haven't even got started or are about to start, or if it's three days in advance.

Also you need to make sure that you have set rules about what can and cannot happen that everyone can agree on. How far things can go and the like. Without these guidelines repurcussions are inevitable!

Just my two cents.
SK

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Kitty's Lingerie
Kitty's 1000th
Surprise Threesome
Lazy Evening
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Once you can accept the universe as Matter expanding into Nothing, that is Something. After that, wearing stripes with plaid is easy. --unknown