Though I've done it outside numerous times I only got caught once... me and this girl were going at it against the wall of a public tennis court. This old lady, about 80, was walking her dog and walked right past us... we didn't stop, but instead just looked at her. She just said "morning" like we weren't up to anything. We returned a "hi" without to much of a straight face, then proceeded to laugh as we finished up...

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"Don't be afraid like a fool; Touch the fullness of her breast; Feel the love of her caress; She will be your living end." -David Bowie, Lady Grinning Soul