Thanks for the question. It is really unfortunate to know that one of your friends got infected with herpes. But I am sorry that no home remedy or even sophisticated medical treatment is available to treat herpes and to eradicate the virus fully from body. If a person gets oral sex from a person having herpes or cold sore infection, it is sure to get transmitted to the other person, causing herpes or cold sore, according to the type of virus he or she transmits. Of the Herpes simplex virus variants, type 1 causes cold sore and type 2 causes genital herpes. You can advise him to take blood tests for herpes type 1 and type 2 to get the infection confirmed. It is not recommended to go for unprotected sex with sex workers. Moreover, HSV can transmit to others even through protected sex with condoms. This is because it can be spread through skin to skin contact with infected people. Hope my answer helps. Take care.