Have another person taking notes while the bride opens her gifts. This person will write down various comments the bride says while opening and inspecting gifts. For example, "Wow! It's so cute!" Then after all the gifts are opened, the note-taker can read the bride's comments back letting people know that this is a prophesy of her wedding night. Imagine how the innocent phrase "Wow! It's so cute!" can refer to other things when taken in a sexual light. She'll be blushing in no time. While the bride may know that this sometimes happens, be sure to never mention it to her and have the note-taker be discreet.