in the end if if a monstergirl want she can also have realtionship or sex with woman or other monsters love and sex have many forms.
No there isn't. In fact, there's really only two forms.
1. They get corrupted and only want to have constant monogamous sex with their completely-arbitrarily-selected husband
2. They get corrupted and will form a small harem to have a committed bigamous bisexual sexual relationship with their arbitrarily-selected husband and lesbian rape victims.