does it take alot of work in having strait sex to get aids.

hiv is a hard virus to transmit and its harder to get if your a male and only have sex with female.
the risk associated with unprotected vaginal sex with a person of positive status is .001-.003, or 1-3 out of 1000.
Now, don't think just because the number is so small it can't happen. For many it probably happened from one incident.
Always use a condom for sex.