The Joy of Sex
 

Wondering how many people owned a copy. It was published in the early 70s, large format paperback, and covered all aspects of sexuality. Tone was non-judgemental and included lots of black and white illustrations of various activities. It was designed like The Joy of Cooking with chapters like Appetizers, Main Courses, Desserts, Sides, etc. I was given a copy by one of my sisters when I went away to college, it had a note with it that something like "I know you're not inexperienced, but I learned a lot from this book". Anyway, I kept it on my bookshelf in my room both in the dorm and in my house when I moved off campus.

Interestingly, only two women every commented on it. One told me she had a copy as well and we left it at that. The other was a girl I ended up dating for over a year, Diane. We hadn't been together more than two or three weeks when I came back to my room after using the bathroom and Diane had gotten it off my shelf and was paging through it. Our relationship at this point was strictly oral as she did not trust condoms and wouldn't take the pill because she was Catholic as it was forbidden. (she changed her mind about that after we had been together a few months) And I never asked if there was some oral sex loophole in the catechism, why ruin a good thing?

At any rate, she got to a page where there was a drawing of a woman titfucking a guy and she said she'd like to try that. I naturally told her I was game, she rolled me onto my back, went down and started sucking me and then wrapped her boobs around my cock and started moving them up and down. My orgasm took her by surprise, the first shot hit her right in the face, the rest coated her neck and chest making a huge mess. She rolled onto her back when I was done and asked me to get her a towel. I told her she had to clean my dick off first and she did. I got her the towel and she cleaned herself up.

It was pretty clear she didn't like my cum all over her chest, so after that she would pay close attention and take me in her mouth when I started to cum, she'd only let me cum on her chest and face when we were in the shower.