Jock itch advice 

Jock itch is the name by which a fungal infection, caused by a fungus called Trichophyton rubrum, is better known. This fungus attacks the damp, moist area of the groin. The infection is aggravated by chafing and rubbing. Sometimes a certain laxity with hygiene in these areas is also responsible for the fungus attacking. However, unless you are certain of what exactly you are suffering from, I would strongly recommend visiting your doctor. The doctor will be able to help you identify the reasons for the infection. As far as I am aware the infection does not spread through sex. However, if you have noticed certain symptoms of an infection and believe it is related to sex, then you should certainly visit your doctor.  
 
What you need to do is to change your underclothes are often as possible. If you are the kind who believes in regular work outs and jogging in the evening, then you should change your clothes after every one of these sessions. Try taking a hot water bath or shower after you get home from work or the gym. Drying yourself well is the key to avoiding future infections. However, if you are not certain about drying yourself well, then you can use a hair dryer to do this work for you. Dress in loose clothes made of natural fibers.