They always say you never forget your first time.
Let's have two categories:
And if possible, let's split those into two more sub-categories:
a. Your actual first
b. The oldest/earliest issue or strip by date
How much detail you put into the description is up to your own discretion, but let's all remember the site rules.
Let me sift through my memories a bit and I'll get back with my own answer/s. I've always been intrigued by the history of sex in this genre.