Using sexualized language can create an environment that is unduly hostile to women, even if this is not intended. Many of the biases against women that such language provokes are totally unconscious, so even if the intent is not harmful, it can be bad regardless.
More info here: http://geekfeminism.wikia.com/wiki/Sexualized_environment
Wording in this comment borrowed from here: https://github.com/alecthomas/voluptuous/issues/287