Female viagra or medicines for sexual dysfunction in women?

I think my boyfriend is cumming on the side of my head while I sleep. I go to bed with clean dry hair, I wake up and all the hair above my ear is saturated, crispy, stuck together and dried stiff( not root to end but about root to 4in down in a 2in diameter), a little tacky or sticky texture. I sleep on the opposite side of my head. There is nothing on my pillow of sheets. He is the only one in the room with me. Is this possible?