Opposed, not for any moral reasons but because we just don't win with it.
Men get>pleasure >an ego boost>a status/reputation boost>bragging rights
We get>maybe pleasure if we're lucky but an orgasm is unlikely>a drop in status/reputation>a potential drop in self esteem depending on how shitty the guy treats you in and out of bed>pregnancy risks
It's literally letting a man look down on us and think we're easy sluts (not necessarily fair or true but that's how they think), and making him feel good about himself/rewarding him for it with pussy. Unless he is so crazy hot that the dick is worth it, or he is an uncommonly kind guy who won't think less of you for it, it's not worth it. Some girls like the validation and attention but I really think, overall, it's a net loss to our self esteem and confidence.