The urethral opening is at the tip of the penis and is the exit for both semen and urine. The urethra is the tube that leads from the bladder to the outside. Because anal tissue is more delicate than vaginal tissue, tears and injury are much more likely to occur. The natural lubrication that occurs in the vagina is also absent in the anus so lubricating jelly is often necessary to prevent injury. Because of the possibility of small tears during anal sex, the transmission of disease is more likely so caution and the use of condoms is recommended.
Oral sex is called fellatio when performed on the male and cunnilingus when performed on the female.
This type of sex is frequently practiced with a false sense of security. Keep in mind that oral herpes can be transmitted to the genitalia and in some people HPV can be transmitted this way. Outer sex limits the risk of pregnancy and sexually transmitted disease if there are no open sores on the external genitalia and if ejaculation occurs away from the opening of the vagina. Outer sex can be difficult to control and the desire for more may lead to intercourse. Keep this in mind before engaging in outer sex without a handy supply of condoms.