Is this normal for men?

Im 35 married with 2 kids.I get hard all the time and specially whenever i talk to girls at work or anywhere.Specially this happens if i talk to a girl about my victory in a game or soccer or anything like kickboxing which i do every weekend.I feel guilty afterwards as i can't accept being ually by corworkers etc.but still it gives me great pleasure and i masturbate very regularly...and also out of the 24 hours of a day my is rock hard most of the time specially in the early mornings...tks...for your answers.