This position is known in English as "Cowgirl" but considering its place in the so-called Japanese Kama-sutra, I'm not sure if using the Japanese name, *hyakuhei* wouldn't be more appropriate. Especially since most of the other 48 positions don't have English equivalents for their names as far as I'm aware.
Position 34:
Drizzling Tea-grinding Mill
"100 Enclosures";
most recognizable as the "Cowgirl"