As a sucker, it seems to me most guys really do have a preference one or the other. Sooner or later, they will take charge and position themselves the way they want to do it.
Standing is probably number one. Of course that includes a lot of glory hole guys. I think lots of guys who like to get serviced really like glory holes.
Kick back in a chair with legs spread is second. Somehow I think this is a straight guy thing, but maybe its just an impression and represents the sample of straight guys who are willing to let a guy service them. Stretched out on the bed with me crawling up, so to speak, is rarely the choice, but that did happen just recently. Some guys really like to face fuck; I think they are really experienced at getting blown; a best way this works is me slouching on the chair [like an arm chair] and they hovering over me holding to the back of the chair.
Im not good at deep throat so I havent had the experience of my lying on a bed, my head hanging down as I take it deep. As I understand, its the easiest way to do deep throat.
These are all examples of my basically giving service, maybe a stranger, maybe a straight guy, something like that. None of it to be confused with lovers in bed rolling around and maybe doing some 69.