I've been with some really big guys and loved sucking on them and never considered allowing them in my ass, but years later after experiencing anal sex with many men of 6-8" I never thought any of those bigger cocks would ever fit comfortably inside. Boy, was I wrong, I was amazed how far my anus stretched open to enjoy those thicker, longer cocks. I also learned that the size of the cock does not always mean you'll get a bigger load of cum. The 7-8" cocks I've enjoyed always produced more cum than the 10-12" guys. Big surprises can come in smaller packages.
If I'm giving a hand job, the bigger the better. For oral, smallish is better, because when he starts going for it, I like to take in his whole shaft all the way to the balls without choking or dislocating my jaw. So yeah, diversity is good.
ok, giving my two cents worth, because you guys seem more obsessed over size than we are! lol! So, I haven't had a huge number of partners in my life, but I've had enough that I have a sampling of various sizes. So, not to burst your bubble guys, but big or OMG is not all it is cracked up to be. I had one partner that was large in size. Honestly, I found myself giving him more hand jobs than anything. It definitely was fun for that. Or even just to see his bulge as he got hard in a pair of sweatpants. But, sex-wise, it wasn't great. And there was no way I was letting that in through the back door! I had another partner who definitely was well below average in size. But, I gotta say, I loved giving him oral. It was just so easy and I could get creative and play with the entire thing easily in my mouth. And boy did that guy cum hard, which I really liked. By far, of any guy I've been with, he had the largest cum shots, which I loved. Of any guy I've been with, he was the one I always looked forward to sucking off. Not the best sex though. And the rest of the guys I've been with fall into the average category I suppose, which I guess for me is the sweet spot between oral, front door, back door, etc. So yeah, that's what gets my vote. But it really depends how he uses it and what you are looking for, ya know?