Use strong condoms and water-based lubricant for vaginal sex.
Use a condom when giving him oral sex.
Him giving you oral sex is no risk.
Kissing in any form is no risk.
Mutual masturbation is no risk.
Condoms work - use them properly everytime and you will avoid infection.
As far as life-span goes, with increasingly good drug therapy, there is every chance that a positive person can live a normal lifespan.
The fact that he is bisexual means nothing at all in terms of his hiv status now.
For further advice, from experts (some of whom live in serodiscrodant relationships), visit aidsmeds.Com, which provides clear cut and up-to-date information.