If its very big, then lying on my front is easiest, as I can totally relax myself, and concentrate on breathing. then once ive managed to open up and let him in, i can push back into doggy style, opening my asshole up to his pounding. i love it on all fours, then turning over with my legs up , watching his face as he pounds me,..
Ive met a really hung guy with a downward curved cock recently,. it was HUGE and for that, i had to be on my back, legs up over my head. once Ild figured that out, it was manageable, and awesome.