can i suggest that you read another thread? It may NEVER be an issue-but the issue its about came about due to some serious miscommunication of personal boundaries (where he felt more comfortable with casual sex then she did).
That said-you're on a good track taking time to decide how you want to do things. I can't give specific advice, as we are (as someone else mentioned) polyfidelitious (how the heck do you spelll that it always feels like I spelled it wrong!) but I'm very interested in answers!!