What is the likelyhood of passing genital herpes onto a woman when she performs oral sex on an infected man?

and during the sexual act he has no signs or symptoms?

Genital Herpes are transferred though any kind of sexual activity. However the person with the STI generally transfers the virus while he/she is having an out break, out breaks are the sores that form on and around the genitalia and are contagious up to two weeks before sores form. It's hard to say how likely it is to transfer the virus because it's practically impossible to tell exactly when you're contagious. The best thing to do is to make sure you use protection. The best form of protection is a condom when it comes to oral and vaginal sex if the male is infected.

If she has any cuts or small bleeding around her oral area, then the possibility of her getting genital herpes from the oral sex is high. Keep in mind that a simple activity like brushing your teeth will cause micro-cuts in your gum and lips. you won't see actual grossly visible blood, but the cuts are there.

just stay away and give ******* to someone that's clean without any STD.

I had sex w/ some ho' that had herpes. She never told me til later on in the relationship. She never had an outbreak or nothing to lead me to think of that. Luckily I've been tested since, & have had a baby since with another girl & I am clean. I would never risk it though, all it takes is one time & some shi**y luck & ur screwed for life.

protected 60%
un protected 90%

VERY LIKELY.. use protection for gods sake

The herpes will be transferred to the female and she will develop them in her mouth... Gross.

so you had sex with person with herpes .. no big deal , you got good medicines to cure it .