Of the miraculous effect of the example of Sebastian, Legenda Aurea reports
"And Saint Gregory telleth in the first book of his Dialogues that a woman of Tuscany which was new wedded was prayed for to go with other women to the dedication of the church of Sebastian, and the night tofore she was so moved in her flesh that she might not abstain from her husband, and on the morn, she having greater shame of men than of God, went thither, and anon as she was entered into the oratory where the relics of Saint Sebastian were, the fiend took her and tormented her before all the people."
Sebastian was also said to be a defence against the plague. Legenda Aurea transmits the episode of a great plague that afflicted the Lombards in the time of King Gumburt, which was stopped by the erection of an altar to Sebastian in the Church of Saint Peter in the Province of Pavia."
I'm not religious at all but I do love old paintings of St Sebastian.