Who said guys don't have toys to use

Oh yes of course, this works. Works best on a flaccid penis. At least in the beginning stage, since as the longer the cock remains in the vacuum "hole" and goes deeper to form a seal, it naturally performs it's function drawing blood into the cavernous parts of the dick and creates an ERECTION!
Even though (except for those with a vacuum cleaner fetish) there is NO other sexual stimulus albeit mental imagery, there remains the very loud fapping noise caused by the vacuum's high pressure sucking upon the Cock's glans nerves and dependent upon the amount of left over scarred circumcision skin the enormous amount of vibration that the suction fapping to the cock's penile frenulum is constant and ongoing even though (beyond as well) the nutting!!! Such powerful and essentially hands free orgasms can become VERY addictive!
Nostalgic too!
Since it's something I haven't practiced now having stopped around a short time after puberty. Once my cock got a taste for REAL PUSSY I stopped cumming in my Mom's vacuum cleaner. The only down side to stopping was that it was a lot easier to clean up when you let the vacuum suck you off!