@Ouchouchouchy, genital warts are not caused by the herpes virus, but the Human Pappiloma Virus (HPV).
Quite a few people carry the herpes virus, many are symptomatic and many are a symptomatic. Not as high as 70% though.
Many more still, closer to 80%, carry one or more strains of the HPV virus. Only a few cause genital warts, and only a few can lead to certain cancers.
@sandybeaches74, in all likelihood, if he has only had one outbreak, and it was years ago, his body will have cleared itself of the virus. We didn't used to think this was possible, but it would appear likely. Even if he still carries the virus, the likelihood of passing symptomatic warts onto you is very slim.
The strains which cause warts do not cause cancer.
If you did get a wart, which is very very very unlikely, treatment is fairly simple and there aren't longer term complications.
In short- don't worry. Go for it.
I work in sexual health by the way.