Oh dear, No, buttplugs aren't to stop "anal seepage" they're for good old fashioned pleasure just like most other sex toys. Just ask any sex worker... most guys don't know it, but even the straightest of straight often react favourably to a discreet finger up the bum whilst getting down to business. Sex workers often employ this trick to 'hurry things along'. The shape is such with a wide base to stop it being 'sucked in' (resulting in a trip to your local very understanding A&E), and the big head is to apply pressure to the back of the prostate (that's the bit that is meant to feel good...). Apparently a similar technique is used (but with white coats and big ol' rubber gloves) to havest sperm from cattle to then be used to inseminate herds. It's true... I read it somewhere. Erm... I'll just get my coat. Steve