Polyamory is the practice of intimate relationships with more than one partners with the consent of all partners involved.
It has been described as consensual, ethical, and responsible non-monogamy.
Sharing is hard, especially when it means giving up something that's important to you.
Many people assume poly folks are above feeling jealous. They arenít.
The major difference, however, is that poly people learn to respond to feelings of envy with openness and curiosity, rather than shame.

A perfect poly person does not mean you never feel jealousy and you're always perfectly happy about what your partner does.
Humans are messy creatures.  We have messy hearts that feel things strongly.
Jealousy doesn't mean you're doing poly wrong, it just means that you're having feelings.
Looking at those feelings and acting on what they are telling you is sold as a path to Nirvana.

Jealousy is the result of poor communication.  You need to go over your concerns and fears with your partners. 
Resolving those issues often means moving on.  Knowing when to hold and when to fold is a tricky business, focus on you.
We are born into polyamory, we swing from branches in trees looking for resources, safety, comfort, and a safe place to anchor.
Exchange of bodily fluids and infection work both ways in vaginal intercourse.  Sexually transmitted infections are carried in ejaculate, pre-ejaculate, and in vaginal secretions.  Any contact between the penis and vagina is a risk for transmission of infection ó for both partners.
Intercourse is not necessary to spread many infections. Herpes, HPV, scabies, and pubic lice are all spread through skin-to-skin contact.