That was a very thoughtful and informative post. Thank you. I especially like your idea about a socially responsible porn company....
The thing is, I specifically asked about non-sexual situations, and included that porn doesn't count, for a couple of reasons. ....
I became curious enough to ask because it is common knowledge that a man's flaccid size doesn't necessarily inform his erection. ....
Anyway, thanks again. Do you have non-sexual opportunities to compare?
I hadn't really intended to to address your original question, but was just commenting on what I saw as an interesting dichotomy of sexual experiences reflected in some of the responses. But now you have me thinking...
It is true that flaccid size doesn't necessarily correlate with erect size. Indeed, some of the biggest-dicked guys I know seem to vanish when they are soft, at least as far as any bulge in their pants goes. But there is one correlation you can be sure of: If someone is large flaccid, they are at least that big erect. As some of my friends enjoy pointing out, I'm larger flaccid than many men are erect. Therefore, when one of those guys sees me in the gym locker room or shower, they know for sure that I am bigger than they are, but just don't know exactly how much, and I have no idea about them. So that is one completely non-sexual case where some comparison, although incomplete in detail, does occur, with results that definitively tell a guy that he is smaller, and someone else is larger.
There are medical cases where full-on erections come to be seen, in at least a one-way comparison. A while back, I decided I'd like to use trimix now and then (yes, I'm that age, so I'm allowed). I went to the doctor, who did some calculations, then administered a trial dose and left the room. A few minutes later, his assistant came into the room to see how things worked out. "Wow!" was all he said at first. So there is a completely non sexual case where one man gets to observe the full-bore erections of others (mine and all the other patients).
In another medical case, I had an injury that caused one of the lymph nodes in my groin to get blocked up for a while. In addition to some other swelling (edema), this caused my penis to "inflate" to its full erect size, although not rigidity, for days. During the time I was in the hospital there were both actual medical observations of this, as well as a steady stream of looky-loos who would conceal their ID badge and offer some bullshit excuse as to why they had to come into my room and "check" my condition. (The only honest one was the little old lady with the walker- she really was a compassionate care aide from my doctor's office legitimately checking up on me at my GP's request.)
Some of the conversations with the doctors were interesting. Before the urologist showed up and correctly diagnosed the situation, I was attended by a hematologist, who was convinced there must be a blood clot. So he sends me down to ultrasound to check the circulation. The ultrasound tech, who was also gay, rather enjoyed this, and told me that all looked good. But the doctor, who was barking up the wrong tree, would not believe this, and began asking me questions.
Dr: "Is your penis normally that LARGE?" Me: "Not when flaccid, but it's about like this when erect."
Dr: "But is your penis normally that THICK?" Me: "Yes, when it's erect."
Dr: "But is your penis..." Me (cutting him off) "Yes, I've got a big cock."
The poor tech was trying so hard not to explode laughing. But you could see the doctor was feeling insecure, trying to rationalize that my penis couldn't really be that size normally, even when erect.
Another example of one man seeing another with an erection happens in the case of exhibitionism. There are actually some venues where exhibiting your erection in a certain way is not illegal (or is at least tolerated by the police), nor considered inappropriate or creepy. Examples include the Dore/Folsom fairs in San Francisco, Southern Decadence in New Orleans, etc. (Ah, fond memories of ring toss with the strings of Mardi Gras beads.) As neither the exhibitionist nor the observer are intending to have sex, this could be taken as a non-sexual encounter. However, these events are so few, and so specialized, that this is probably not worth counting. And while exhibitionism exists everywhere, outside such special events, well, it's just gross.
But it starts to become more difficult to distinguish sexual and non-sexual situations in other venues. I often see guys with full erections in the gym locker room (I work out regularly). Sometimes these are guys who seem to confuse the gym with the sex club (i.e. they start jerking off in the shower or steamroom), so we will not count those. But some men do seem to get spontaneous and probably unwanted erections at times, unrelated to anything sexual around them. I remember one guy, with a bottom locker, who dropped his towel to reveal an almost throbbing (although rather thin) hard cock, then crouched down by the locker trying to conceal it as he dressed. Since I was an unintentional witness to this, thereafter he took great pains to always get a locker far from mine if he saw me. God only knows why he didn't just keep his towel on, and go watch the TV or something until things subsided. There are quite a few other guys who just seem to get hard when water hits them in the shower, but don't seem to be trying to do anything sexual, and get soft again as soon as they dry off. Maybe it's just how they clean their cock or foreskin? But of course anyone walking by the row of showers sees it all.
On another occasion, there was a guy dressing next to me, who was quite large flaccid. We both started to get hard as we dressed, and the reason clearly was seeing each other. But although the root cause was sexual response, the situation was not sexual-- we were honestly both just trying to get dressed and go for dinner, and after getting 80% hardons stuffed in our pants, we left without a word or second glance.