SensuousCancer: No, he doesn't have to be restrained really but when he does it that way it's usually soft and slow. He is large enough that he has actually done anal that way... from the front... with my legs closed!
Might be unusual but when we're together it almost ALWYAS includes anal. It's usually the reverse of missionary, laying on my stomach, with his legs outside mine and he can, and does, pound it. There is nothing like the feeling of closeness to be enfolded by him, body over mine, legs holding mine together, holding my hands with fingers entwined, kissing and sucking on my neck. All that combined with the intimacy of anal is wonderful. His size may be hard to take but it's worth it.