Man I love this subject. One of the hottest parts of queer sex is seeing a wide gaping asshole. Nothing says "I like getting ass fucked" quite like a well opened hole.
And, feeling my own hole wide open, exposed and ready for more cock is even hotter. From my experience, I find that just a single cock, regardless of size, does not seem to leave much of a gape. But in a group type setting, by the time bachelor number 3 comes around, my hole is primed and ready. No doubt, some of that is mental as well.
But, a dildo...perhaps because of the texture, temperature or whatever seems to do the trick right off the bat. Of course, a small plug leaves a small gape and a huge one....well it is directly proportional. This past weekend, I rode my 10" dildo a few hours after getting fucked, then followed that up with a few hours with my largest plug (weights 22 oz, glass....). Once I pulled the plug on that fun I had am amazing gape...and it seem to last (to some extent) for better than an hour.
Would love to see more photos of wide open holes. Will have to work a bit to get one of mine posted here.