They assert that since the front wall of the vagina is inextricably linked with the internal parts of the clitoris, stimulating the vagina without activating the clitoris may be next to impossible. The problem - which is country-wide - has raised fears that the pollutants could also be contaminating our drinking water - and even be affecting the fertility of men. Although the clitoral body becomes engorged with blood upon sexual arousal , erecting the clitoral glans , some sources describe the clitoral glans and labia minora as composed of non-erectile tissue; this is especially the case for the glans. We are living in a male society which has not sought change in women's role. The two corpora forming the clitoral body are surrounded by thick fibro-elastic tunica albuginea, literally meaning "white covering", connective tissue. She argued that "the male clitoris" is directly beneath the rim of the glans penis , where the frenulum of prepuce of the penis a fold of the prepuce is located, and proposed that this area be called the "Lownde's crown. Previous studies have that cod, trout and flounders are all being feminised. This might be with or without manual penetration of the vagina, while other women enjoy having the entire area of the vulva caressed. The frenulum of clitoris is a frenulum on the under-surface of the glans and is created by the two medial parts of the labia minora. While it may not initially have a big impact on stock levels, a reduction in the number of breeding males could lead to all sorts of genetic problems in later years. The urogenital sinus persists as the vestibule of the vagina , the two urogenital folds form the labia minora, and the labioscrotal swellings enlarge to form the labia majora, completing the female genitalia. Initially undifferentiated, the tubercle develops into either a clitoris or penis during development of the reproductive system depending on exposure to androgens primarily male hormones. Experts say female hormones from the contraceptive pill and HRT are being washed into our rivers and causing male fish to produce eggs. For example, while some sources estimate that the human penis has 4, nerve endings,  other sources state that the glans or the entire penile structure have the same amount of nerve endings as the clitoral glans,  or discuss whether the uncircumcised penis has thousands more than the circumcised penis or is generally more sensitive. As any sexual act was believed to require that one of the partners be " phallic " and that therefore sexual activity between women was impossible without this feature, mythology popularly associated lesbians with either having enlarged clitorises or as incapable of enjoying sexual activity without the substitution of a phallus. Females may also be affected, producing abnormal eggs. Believing that vaginal orgasms are "a physiological impossibility" because the vagina has insufficient nerve endings for sexual pleasure or climax, he "concluded that satisfaction from penile penetration [is] mainly psychological or perhaps the result of referred sensation".