when a ogre, ork, werewolf or lizardman is beaten by a human woman did they accept this in the same way by man who beaten them? human woman can be strong as man and if monstergirls accept strong humans maybe they don´t care about if it´s a man or woman. that monstergirls have sex with human woman or married her her if they want or accept her as master can be happening in this strange world.
it would be rare if a monstergirl is lesbian with a human woman in this world but love and sex have many forms and ways so this would be sometimes possible. that monstergirl have sex with human woman or other monstergirls is also possible. when human man have a woman and a monstergirl at his side it will be not surprised that a monstergirl become bisexual and have sex with the woman too or they liked to have sex with the man and woman at the same time.