Late 1970s
It was amazingly easy and profitable. Few magazines and they were fairly softcore. Still a hardcore porn shop business but being harassed by uncorrupted vice squads around the UK.
Magazines in the UK were making a fortune due to the lack of alternatives. They could be bought anywhere and even if softcore enough to get a guy hard and off. When a hairy pussy shot is the max, that's all it takes. Today it takes 50 guys cumming onto a girls face and even that leaves most bored.
In Europe some countries had legalised porn and the guys who used to jerk off to softcore mags, now jerked off to hardcore porn. The increase in revenue was only due to the increase in supply. Few guys who would never buy a softcore mag, now bought hardcore porn. Wankers need something and will use what they can get, is a bit general. But still true.
Erasmo will tell you about the revenue John generated in the UK with his softcore videos and magazines.
I simply filled a gap with explicit open leg shots and more in colour photo sets.
Lesbian shots were great sellers.
Open leg virgins also sold.
As for close ups of a wet Asian pussy. Sold like hot cakes. Enough to fund trips to Thailand to shoot pics of hookers, went twice a year. This was one of my sexetaries .
Dog walking time.