Assuming that anyone identified as a man can never have less than 1.0 manliness (100% normalized between 0 and 1) by definition, and further, that a man topping another man is producing manliness in excess of 1.0, while a man bottoming will never drop below 1.0, we can conclude that a gay orgy will have more total manliness on average, than the same number of men individually.

N = number of men.
M = average manliness of individuals
L = additional manliness caused by topping.

(N * M) + L >= N * M

Guys, we could do a paper. Let's do a paper.