The answer depends entirely on your and your partner's personal beliefs and values. The engagement itself doesn't dictate whether or not you should sleep together.
Based on the provided reference, the person expresses strong affirmation: "Absolutely!!!!!" However, they also emphasize that an engagement is not a contract: "It's not a written contract until after the ceremony!!!" (13-Sept-2016). This means you are free to choose what is right for you.
Ultimately, the decision of whether or not to sleep together after engagement is a private matter between you and your partner. Consider your religious beliefs, cultural values, and personal comfort levels when making this decision.
