Well, as we see in Ch2, she het-slept her way up before meeting the Villainess.
Mayne has gone through a lot,and a lot of it was unstatisfying(the crown prince lasting only three minutes after her low noble adopter most likely lasting longer),but now she gets true happiness(which can last three days),without having to lift her fingers as much as before.
Albeit,I don't think she slept with that many in comparison to how much she had to study.
And I doubt she did as much as this lady.
All the way from 1998.