I love my mooncup wish I had known about them ages ago. My AF now ends with an abrupt halt on Day 4 which is fantastic (as I have a history of fibroids and very heavy periods). I am sure it has made my cycle shorter. Still very heavy on day 2 & 3 but the mooncup seems to cope with regular removal and emptying!
However I did lose my first one down the loo at work and have worked out the solution to this is to put some loo paper in the loo first! And if the loo has no handbasin then I take in a bottle of mineral water or bottle filled from tap to give it a rinse out.
At least two of my RL friends use them. We do discuss this sort of thing in some detail regularly. Are we weird?
However I don't use it at night (use a pad) or when mooching at home (as I didn't ever use tampons like that). it was the same when I used the cap always whipped it out as soon as poss. Like to keep the use of rubber in there to a bare minimum.
And I boil mine in a pan from time to time any old pan will do don't see a problem there if the water is boiling anyway.