Gender Ultrasound

Emily • Momma of 2 sweet boys💙, married my love😍, and carrying my rainbow baby🌈
Ok so I am pregnant with my 3rd. I have 2 boys already so I'm kinda hoping for a girl. 
Anyway, I don't really want to find out what I'm having, but my husband is quite adamant about knowing. So we are compromising about doing a gender US but not see/find out and have the tech put the results in an envelope. Then have an exploding target that, when shot, explodes with the color of the gender. 
The dilemma here is that at both gender scans with my other two, I saw their little pee-pees long before the tech stopped wiggling the wand around to zero in on the genital area.
So my question is has anyone done this and what did you do to not see the results? Not watch the whole time? Or what? I can keep my eyes closed but I seriously doubt my husband can. So advice please?