Am I Ready for an Open Relationship?

Since we had the threesome, it really let us know what we were honestly realistically comfortable with. I knew I was comfortable with him being with another woman... and this showed him how comfortable I was. What next presented itself was... was I comfortable with him being with another woman when I was not around. This I believed I was okay with, but really didnt know how I would feel once it happened.
One Morning he said he was invited over to a "new friend's" place to have an "afternoon delight". He kept asking if I was okay with it. I said yes... to make it kinkier I asked him to send me a photo if she allowed... something to tease me while I was at work and couldn't do anything about it. This was the biggest turn on for me... knowing he was first having fun in the middle of the day excited me. Then seeing a photo of him having fun really got me turned on. He later told me how tight she was and how it was nice having sex with a younger girl, who he could flip around easily. He said he really liked her young lips around his cock sucking up everything.

 Afterwards, he began chatting with her through texts and chats online. She even did a little strip show for him over the webcam one day, of which he enjoyed very much. He felt lucky to have a girl on the side and with me to be okay with it. But this did present an issue.... 

How much communication and outside the bedroom relationship should be allowed? I felt fine if I was there, but I didnt want him to turn a bedroom relationship into something with feelings on either parties part. There needed to be a line drawn. Before anything happened, I let him know this shouldnt be an everyday or every week thing. He shouldnt feel like he should be doing this every day. This way we can achieve our goals without any tension or feelings hurt. Because out of everything, we are a couple with the same goal... and in the end, it will be us. 

I enjoy having an open marriage with other women only. I would love to have an open marriage with another man as well down the line, but I do not think my significant other would be as open to that. He knows I am bisexual and is okay with sharing me with another woman, but bringing another man into the relationship is hard for him. He has so many rules. One being, no oral sex given to the male. This is hard for me, because this is what I enjoy doing the most. I would love to have a threesome with another man and my significant other but I know this will never happen. I am tempted to get a strap on... this way, one of my "girlfriends" can use it on me. Maybe if he sees me being fucked by another person while I give him head or something might intrigue him. HAHA... Women in general are so sneaky. I dont mean to be... he's stated he wants to be fair with me and one day have a threesome with another guy or a foursome... but I know he needs more time with that idea. I think this will just help in the long run.

But for now... I think I am okay with an open marriage, as long as I know he is only in it for the physical aspect of the relationship.