The first stanza ends with the lines "A pain for us it is to love, / But is to men a pleasure," and the last stanza ends with the lines "More freedom give to womankind, / Or give to mankind less." Both of these couplets feature a chiasm:
A painfor us it is to love,
But is to mena pleasure
and
More freedomgive to womankind,
Or give to mankindless
The inverted order of these structures highlights the contrasts between "pain" & "pleasure" and "us" & "men" in the first couplet and between "more" & "less" and "womankind" & "mankind" in the second.
The line "Or give to mankind less" also contains a somewhat significant ellipsis. "Freedom" from the previous line is implied but not explicitly stated ("Give to mankind less [freedom]"), and in a way, this omission matches the meaning of "less."