Haha Yogi there is no such thing as TMI when TTC! If we BD in the morning, I would try to stay lying down for at least 15 min...longer if it's a weekend morning. If we BD at night, I try to pee first so that I don't have to get up again and then just go to sleep with all that lovely stuff in there. It can be pretty messy... a wad of tissue can make a good temporary 'plug'.
You can try putting a pillow under your butt with your legs up in the air to keep it from leaking out and give the swimmers a little gravitational help, but this might just be an old wives tale!
Apparently the highest concentration of sperm is in the first bit of ejaculate, and it comes out with so much force that some of them will start swimming into the cervix almost immediately. That reminds me, my DH and I are supposed to watch the "great sperm race" on youtube sometime.