The clitoris is often larger internally than its external visible part. The clitoral body extends backward into the pelvis toward the vagina and urethra, forming what is known as the internal clitoral shaft. It ends at the base of the clitoris near the urethral sponge, which swells during sexual arousal to form an erectile organ called the "bulbs of the vestibule." The bulbs can become engorged and extend even further inside the vaginal wall when a woman becomes aroused. While the external clitoris serves primarily for pleasure and stimulation, the internal clitoris plays a role in both male and female sexual functioning and may be more important to reproduction. As such, it's essential that women understand the full extent of their own anatomy.
Bulbs of the vestibule
Closely related to the external clitoris, the internal portion has evolved to aid in mating behavior. During copulation, male mammals typically mount from behind, allowing them to easily access the female reproductive tract without exposure. Female mammals have adapted by having a smaller and less prominent external clitoris to prevent accidental penetration while still providing sensory feedback. However, this adaptation leaves the internal clitoris relatively unprotected. In most species, including humans, the male intromission causes the internal parts of the clitoris to contract involuntarily. This action pushes the semen from the cervix up through the vagina, past the uterus, and out through the cervical opening. Thus, the internal clitoris acts as a natural lubricant pump that helps keep sperm in place until they are expelled.
Internal Clitoris and Reproduction
In addition to its role in copulation, the internal clitoris also appears to play a critical part in reproductive success. One study found that females who had larger internal clitorises were more likely to become pregnant than those with smaller ones. This correlation suggests that the size of the internal clitoris is linked to fertility, although researchers aren't sure why. It could be due to hormonal changes during arousal or increased blood flow to the area. Whatever the cause, it seems clear that the internal clitoris is essential for both sexual pleasure and reproduction.