Sir, I Am A Army Man ,i Have No Sex

Sir,
I am a army man ,i have no sex with my wife for last 7 months. but my mother said that my wife has haveing sex intercourse with other persons,but i did not belive that, sir, now i want know that She had any sex intercource with any other persons, if there is any test. please say the name of the test and were it is taken in tamilnadu, sir now i have no sex with my wife.sir,please help me i am really help less