试一试gags,比如ball gag
http://www.arentwenaughty.com/sex-toys-for-couples/bondages-bdsm/fetish-fantasy-series-blindfold-ball-gag-p3011.aspx
http://www.arentwenaughty.com/sex-toys-for-couples/bondages-bdsm/punishment-purple-suede-bondage-ball-gag-p1504.aspx
或penis gag
http://www.arentwenaughty.com/sex-toys-for-couples/bondages-bdsm/tantus-fantasy-gag-p2168.aspx
不可能真正做到静音,但是有效果,其中ball gag的静音效果相对更好一点。