Monogamy (having sex with only one partner) is actually NOT considered a No Risk behavior. WHY NOT? Choose ALL of the valid responses.

1. sometimes partners cheat on each other -- even when they SAY they are only with one
person...there is a chance that they have had contact with someone else

2. monogamy is not physically possible

3. sometimes a partner participates in other high-risk behaviors, like sharing needles,
and their sex-partner doesn't know about this

4.if the partners have never been tested, one of them could be currently living with an STI / STD and not know it