PhD in Sexology and Psychosexual Counseling. For More Info WhatsApp- 9604715783/9359863878. Labia Minora (the inner lips) of the female genitalia are homologous with the shaft of the penis in the male. Both the surfaces of the labia minora are highly sensitive to tactile stimulation. As sources f erotic stimulation, the labia minora seem to be as important as clitoris. During coitus the entrance of the male organ into the vagina may provide considerable stimulation for the labia minora.