I think this is a conversation you need to have before you and he go way for the weekend, otherwise you may find yourself in very difficult circumstances. Breaking her trust on this break will set back the relationship by many months.
Perhaps best if you sit down to discuss as three individuals. Ask female partner how she is feeling about it and what are her feelings behind the no intercourse rule.
Also, as male partner for his thoughts on it. Is he going along with the ban because she wants it? is it something he also wants?
If she says she would like that rule to continue, ask her to set a time limit for when it can be reviewed. Ask what she would like to help her feel more comfortable in dropping this rule.