>A condom that can be mounted with one hand, correct side up, and preferably through one continuous movement would probably remove 95% of the annoying and frustrating condom usage problems
use correct size. When condom is smaller than needed - then you have all these problems (and in addition it still leaves enough uncovered skin for direct skin-to-skin contact thus potentially decreasing the STD protection efficiency).
Standard condom size should be good for virtually all people. They are extremely stretchable in width, e.g. you shouldn't have a problem putting one on your head (by which I mean the head that sits on your torso). Soft tissue is the real danger for STIs, which is well covered with a condom of any size. No matter the size of the condom, normal skin will always be exposed. Condom size also has no effect on doing the correct side up.
>Standard condom size should be good for virtually all people.
that a very overstretched (pun intended) statement.
>They are extremely stretchable in width, e.g. you shouldn't have a problem putting one on
with pretty much any condom able to hold a bucket of water, it is theoretically possible for any human male to put it on. On practice, when condoms are noticeably smaller that your size, it wouldn't roll over using one hand and it requires so much frustrating both hands finger acrobatics that it just becomes a separate activity on its own which understandably may affect the mood in some cases. Among the "standard size" i personally met wide variations in elasticity and size to the extent that some [rare] of them i couldn't practically put on (and i'm biologically pretty average). Correct condom size does matter.
I can't say I share your experience. Why is using two hands a problem? I always use two hands and it never takes longer than a couple of seconds. Putting a standard condom on a dildo that's well above the average human penis size is equally easy. Putting on a condom on a (partially) flaccid penis is indeed very hard though since you need one hand to hold it and trying to put it on will push the blood out.
Use which size suits you best, but be aware that a looser condoms will cause more slippage.
use correct size. When condom is smaller than needed - then you have all these problems (and in addition it still leaves enough uncovered skin for direct skin-to-skin contact thus potentially decreasing the STD protection efficiency).