Pubic hair makes a wonderful first base, and though YMMV, it's always felt wonderful to me when someone rubs it.
Freshman year in college… My girlfriend had not been completely naked with a guy, up to that point, so she kept her pants on, early on. When she'd lie down on top of me, both of us naked to the waist, she loved (among other things) when I'd caress and rub her back. Eventually, seeing that she liked her lower back and her hips (through her pants) stroked, too, I asked her if she'd like me to caress her hips inside her pants. She smiled and said, “You can go ahead and pull them down in back… I'm just not ready for them to come down all the way." She raised up, unbuttoned and unzipped, and once she was back down, I pulled down her pants and panties in back. As it turned out, she loved her bare hips being stroked. “Just as long as you stay clear of ground zero.”
When she rolled over, with her pants open but still in place, she discovered she loved her belly being stroked, too… so the next time we got together, she pulled her jeans down and off entirely, just leaving her panties in place.
After some more belly rubbing, her nipples had gotten hard, and she whispered, “Would you rub me a little farther down? Just don't take them all the way off.”
I rolled down her panties in front until her pubes were exposed, and she found that she loved her pubic mound bring rubbed most of all. Though I'd seen a lot more with other ladies, the combination of her shyness and her open enjoyment, letting a guy see and touch her bare hips and her pubes for the first time, was exciting.
As inexperienced as she was, she taught me something the same evening. She had gotten wet during the pubic hair rub, and she moved her hand to the top of my pants (which were still in place) and asked me, “Would you like me to rub you, too?”
None of my earlier girlfriends had ever done that, exactly, so imagine my surprise a minute later, when my pants and briefs were down far enough that my pubic hair was out, and she showed me how good it felt, with her fingers running through it and rubbing my mound.
By the time we'd had a few more dates, of course, we were taking off everything, and the pubic rubs were just the first or second course. But they'd been a nice way to start becoming intimate.
Years later, I loved it when ‘Serena’ (the LMT who introduced me to erotic massage and eventually trained me in it), would begin the “down there” portion of each massage with a pubic hair rub, moving to my cock once the rub had it fully erect.
My lovely female MD rolling my briefs down far enough to palpate me just above my pubis, with my hair fully exposed and her fingertips moving into it… That was fun, too.