... or advanced dildo design as someone helpfully observed in work today?
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/74341132@N00">Chris Hearn</a> from Narberth, UK
CC BY-SA 2.0
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/abercj/5349429255/">2011-01-12: Sleek drinks bottle design...</a>