1)03 Months for HIV testing is most accurate. However 03 weeks after sexual contact is sufficient to go for one.
2)02 - 20 days for signs of herpes if you were lucky. Most people won't show signs or know they have it.
3)Well if he's that worried, might as well wait for 03 months to do a complete blood test to be sure he's cleared. That will really put him at peace.
4)HIV transmission via oral is relatively small but possible. No one can be sure.
5)You only live ONCE.