It is said that approximately 50 percent of men and women come with an allergy to latex. The elastic-like material that comes from the sap of rubber trees is the thing that most condoms are made from now. It has proven to be quite effective as being a defense mechanism against STD's. However, for a few, experience of Latex has been shown to be very irritating and uncomfortable. What do you do when you're allergic to latex and you also don't trust every other methods of safe sex? There are other alternatives. Both Polyurethane and Lambskin condoms are latex free. They are also thinner as opposed to typical latex condom, making sex a little more enjoyable from a sensational standpoint. The only downfall to using Lambskin and Polyurethane are: Polyurethane condoms usually fit a bit loose. You have to be extra careful when taking them off. Lambskins aren't as effective against STD's. They have tiny skin pores in them. Some STD's can certainly break through. Lambskin's aren't ideal for a non-monogamous relationship. Testosterone For instance anal sex without using any preventive measures and then proceeding to continue with normal sexual intercourse can lead to the entry of bacteria inside the urinary tract through the vaginal canal. A progesterone blood test is done to find out how much of the progesterone hormone is in a sample of blood. This female hormone is produced each time a mature egg is released from an ovary after a process referred to as ovulation. This hormone really helps to prepare the endometrium (uterine lining) to take the egg if sperm fertilizes it. If the egg goes without being fertilized, menstrual bleeding occurs and progesterone levels drop.