Warm, Wet Touch
This is a technique that is not often thought of as masturbation, but truly is wonderful. Our genitals remain very sensitive after we've had sex. One thing that feels great to sensitive genitals is to get a wash rag moistened with warm, wet water and place it over the genitals. This can often help a male regain arousal for multiple performance. Safety note: make sure the water is comfortably warm, but not too hot! Test it on your elbow before placing it on your partner.