The site is called DeltaofVenus, deltaofvenus.com-- I'm not linking directly unless that autoformats into a link.
It's mostly images/videos of women, girl on girl, and straight sex, though in several of the films and a number of the photos, there's homosexual sex just thrown in there casually for good measure-- obviously the divide between straight and gay porn was narrower. Last week they uploaded a video that was of two chicks and a dude-- and the two chicks actually had more enthusiastic sex with each other than either of them did with the dude. (The film dates to the 1920s.
So obviously cultural norms were different. And a lot of the erotica was attempting to avoid censorship by categorizing itself as "references for painters"-- hence a lot of artistically-posed female nudes. On the whole the "tone" more often aspires to be higher, simply because any photographer had to have invested pretty significantly into the equipment-- but there isn't actually a whole lot of coyness. The fuck pictures are pretty straightforwardly shots of people fucking, etc. Some of the photos even look candid, which is amusing.
The standards of beauty are somewhat different, but one thing I have noticed: Nobody is fat. People are un-toned, sure; there's lots of pasty droopy flesh here and there. But the people are skinny. The obviously low-budget ones with amateurs mostly feature chicks with unexceptional, slender figures. It's only in the later sections of the archives that you start to see any kind of impressive breasts-- it's fair to guess that nobody working in porn before about 1935 had boobs over a C-cup.
People are bigger now. Taller, more muscled, and fatter.
I knew this already, and more than academically, because my parents are historical re-enactors. In his social group, my father was much sought-after for events because he has retained his 29-inch-waist, and so can fit into actual period garments. He is six feet tall and 140 pounds-- and so he can wear antique military uniforms.
But enough talking. This is enough text, I think, that nobody's going to get an eyeful of antique erotica that isn't prepared for it. ;)
The photos get more explicit as you scroll down. They're not chronological, but I bet you can tell which ones are later just by looking-- the hair, the undergarments, the setting, and most tellingly of all, the actual shape of the people.

Sure, she's untoned, but she's not fat.

She's pretending to be an artist's reference. Maybe she really was.

There's no nudity in this one, but it's more explicitly erotica than the one above.

I love this woman's expression.

Whoa! Boobs! This one is obviously the 60s.

I just love the posed coyness.

This one is modern enough to have color. Shocking!

This is totally just for painters to use to pose the female form. Actually this woman is hella toned-- and shaved! I don't know what year this one is.

Aaaand.... sex! I think this is meant to be a Parisian cafe. It actually might be-- France was a hotbed of the early porno industry.

Another amusing thing is how damned *early* many of today's porn cliches started. Here, it's the delivery boy. I've also seen a movie dated to the 30s of a dude boning the hot secretary. And there's a great one of "nurses gone wild" that's probably pre-1940.

Threesome!!! Mostly I just love the chick's stockings. OMG. It's not a sock fetish if I just want them for myself, is it?

There are several in this photo shoot and I just crack up-- they're all, OK, now it's time to assfuck the man! There's a lot of that. He's like, Uh, ok?

Yes. This is two chicks. You're not just mis-led by the low resolution. That is two chicks, one dressed unconvincingly as a man.

Sacrilicious! Lesbian crucifixion! But what's really great is the seated woman's expression.

This one is so totally candid. Also, is the standing woman pregnant? At least she looks amused. Also I love the stockings in this one too.

Fucking! Most awesomely, the man is wearing sock garters, while the woman has removed her garters and is letting her stockings roll down. THe porno cliche of leaving your shoes on was well in force by the time photography was perfected.
I have a some vintage gay ones, I will search and post some for comparison.
Part of the point I was trying to make is that there is nothing new under the sun. All of today's porn cliches originated far longer ago than you'd think. Two chicks together? Some of the earliest daguerreotypes were "Sapphic odes"-- i.e., lesbians-- and then as now, a lot of it wasn't really lesbians, it was two straight women playing with one another to titillate men. (Though, as I said, there's some pretty heartfelt lesbian sex in some of it.)
And yes-- the attitude towards male homosexuality was pretty relaxed. It's possible that the reason was that since porno was already so illicit, then homosexuality wasn't that much more illicit-- but then, that may not be it at all.
Some very nice pictures I love how huge that one ladies boobs are and she is thin to that is amazing. The thing that surprises me is the one where she is having sex with two guys and looks like she has a pretty firm grip on the guys cock. The fact that there are girls togather is both hot and surprising but what also is in the one picture that a girl has something in the guys butt. That corrsett picture is pretty hot. I'm not sure what effect it has but the fact that pictures where in black and white then does have an effect when comparing them to new pictures.