Not long: Sperm don't live in the air, on clothes, or on other items. Their natural habitat is warm, fresh semen... not on household objects. Therefore, fresh semen on hands, penises, condoms, etc., that is quickly put into a vagina can still lead to pregnancy.
3. Decrease the Inflammation. At the first sign of sunburn, taking a nonsteroidal anti-inflammatory drug (NSAID), such as ibuprofen, naproxen or aspirin, can help with discomfort and inflammation, says Dr. Brackeen, who practices at the Skin Cancer Institute in Lubbock, Texas.
1 Add one or two cups of baking soda to cool water and place the affected area in the solution for 30 minutes. Baking soda may also be added to cool water and sprayed over the skin.  Essential oils such as chamomile and lavender oil are helpful in relieving the symptoms of sunburn.