When you're talking big tits and small waists, you're talking the language of The Porn Dude. Perhaps what I would consider to be my favorite subreddit is /r/BustyPetite - a hub that serves to display girls that are toned, defined, healthy and best of all, packing a pair of kick-ass titties. It's a place I visit regularly and upvote content of whenever something comes across my front page - if that isn't a ringing endorsement of these big breasted petite girls, I don't know what is.
The subreddit boasts 170,000 subscribers, making it one of the biggest communities for adult-related content on Reddit. There are a few rules, but nothing that I would really say breaks the boundaries in terms of stifling submissions or giving users a hard time enjoying the material.
New submissions come in quite regularly - around 20 posts are made on a daily basis and of course, if you want to submit your own busty petite porn, you're more than welcome to. Oh, I should also point out it's all pictures - no videos are allowed.