>What is a good breed of dog for a newbie like me?
You mean you'd really consider this kind of lifestyle?
Make sure you're in it for life, not just a fetish thing. It is very much a lifelong sexual preference, not a weekend thing.
A good breed for this would probably be whatever large dog you think is sexy. However, you need to keep in mind vaginal health unlike most people who simply neuter their pets.
I inject cranberry seed extract, tiny drops of hydrogen peroxide, pomegranate peel extract, a little garlic extract, and a tiny amount of thyme into each of their vaginas on a semi daily basis. Golden retreivers are one of the breeds most susceptile to pyometra, a life threatening vaginal infection. Google that condition for more info.
I then cover their vaginal walls in very high grade Manuka honey with a rating of at least UMF 20+ rating, preferably 25+.
The day after this treatment their vaginas are extremely slick and wet. Very easy to slip in all of them. And it prevents all kinds of nasty infections.
For a starter dog in general, a lot of people do well with German Shepherds or Golden Retrievers. Make sure you have some space for them to run, or the discipline to take them to the park every other day at least. Huskies are very high energy, and dobermans or standard poodles are better left to people with experience handling dogs. My standard poodle is by a slight margin the most sexually attractive to me. But they are all hot to me.
If you decide on a poodle, great dane, or other such breed with a large chest cavity be careful of a condition called bloat. They must eat small meals 4 times a day or more rather than 2 big meals, and cannot exercise directly before or after eating. Bloat can kill them.
Just do research on your breed for at least 3 months before actually getting the dog. And buy from a responsible breeder, not a pet store, or you will be facing huge vet bills a couple years later Not to mention an unhappy dog prone to infections