Recently one of my friend told me that he masturbates on pillows by imagining it as a girl/heroine he likes. I was very shocked when he told me about this but then I realized that I am the only guy he can tell this things to. He said he does this whenever he gets time alone at home by humping on the pillows and kissing. Is this good for his health and sexual life will it affect his love life in future. Should this practise be continued?