You can get what you want from 0.5 strength up to 1.0. However, the base model is pretty crap at nudity and has really strange concepts of genitalia. I recommend using a more general nudity lora at low strength (0.1-0.2) to compensate. I haven't seen one available yet for 14B, but there is a female masturbation one that can do the trick.
I've added another post testing my lora with the I2V 480P model, and it seems to work pretty well. Try it out!