Using anything cylindrical like an aerosol can is risky, since it can easily slip inside the rectal sphincter if you get too enthusiastic. If that happens, you're not going to be able to just push it out (assuming you don't have a butthole so slack that you're constantly dribbling shit). The only way it will come out is if a doctor inserts an instrument to grab it and pull it out.
IIN for a straight married male to think about taking cock
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Using anything cylindrical like an aerosol can is risky, since it can easily slip inside the rectal sphincter if you get too enthusiastic. If that happens, you're not going to be able to just push it out (assuming you don't have a butthole so slack that you're constantly dribbling shit). The only way it will come out is if a doctor inserts an instrument to grab it and pull it out.
But perhaps you find that idea sexy...