I remember how guys behaved when buying condoms because I was selling them...
Way back in the day, when condoms were "rubbers" and were only sold on request from behind the counter at drug stores, and also, in a sketchy way, at gas stations, I was in a college town and worked part time at a local drug store. The counter that sold the rubbers was also the counter that sold hard liquor - and most of the business was in pint bottles. I was frequently assigned to work that counter, keeping things clean and neat, restocking items, and handling sales at that cash register. With time I developed a mental "town happiness index" based on the sales of rubbers and booze. When sales of both were high I figured everyone else was getting laid and I sometimes felt I'd rather be playing than working. I think most guys (I can't remember even once selling to a gal) were happy to find me behind the counter because they were asking an understanding, like-minded and like-aged guy for a three pack of rubbers with all that might imply. You could see they were relaxed compared to how they approached the counter if either of the two older, mother-type women who worked at the store were assigned there.
The store sold lots of brands of condoms. That gave me a chance to read all the packages and try different types - different sorts of built-in lubrication, packaging and so on, but aside from basic dry Trojans in the red package (most popular) and fancier lubricated Trojans with a "receptacle tip" in the blue package, there really was not much of a difference among the brands except for the real premium types - "skins" called "Fourex (or XXXX)" by Schmid and Naturalamb by Trojan. Fourex is no longer available, but these both brands were made from sheep intestine and had the special benefit of transmitting warmth much better than the latex condoms and they were slick. Really felt like wearing nothing once you were inside. Relatively speaking, though, they were expensive. I was selling pre-AIDS, however, so the fact that skins were not adequate protection against viruses like AIDS was not an issue. Skins worked for avoiding pregnancy and standard STD's and for a while were my personal favorite.