You have a man who is 5ft 5in in a relationship with a woman taller than him. Lets say in this example she is 5ft 9in.
Knowing that the overwhelming majority of couples in the world are compromised of either shorter woman-taller man or negligible/same height couples, we can assume that anal sex is done with the man being taller or of a negligible height to his partner.
So, what happens when he is much shorter than the woman with the variation as above? Is it possible without her bending over? Also similarly with vaginal sex standing up, how would it work?
She can grab onto a chain link fence with all fours and position herself lower for the short guy. I know of a video demonstrating this but its NSFW, nor do I want to provide such information to a potential minor. Google can help you with this.
ISTM that given the OPs apparent (and puzzling) expectation that both parties be standing upright on the deck rigidly at Parade Rest, it would be an advantage for the woman to BE a few inches taller, due to angles of entry…