Going by some of my ex-girlfriends, in my yoof, they didn't!. ....even Grizzly Adams would have got lost ☺
.....Brings a new meaning to the phrase Rumble in the Jungle, oh yes :-)
Don't know the scientific answer, Bed.......but my guess would be that body hair is a bit like men.......one quick enthusiastic effort....stop for breath and that's it..... :-(
Joking apart, Ive wondered (and asked) this myself here on AB. doesn't take away the fact (that for me personally) I find most body hair repulsive, especially underarm hair on females.
But, each to their own.