I remember renting a sci fi movie back in the 80’s from a mom and pop video rental store. In the movie a female astronaut in her space craft is confronted by an intelligent talking snake. After a brief dialogue dialogue between the snake and the female astastronaut,  the snake proceeds to slither up the astronaut’s leg, enter her body through her vagina, travel upward through her body and then exit out the side of her neck. I dont remember if the movie was in color or in black and white. Someone please help me with the title!!