Is it normal for old man to like being used for giving girls at work o

I have a job that has become where I spend 4 hours going down on these lady's that have husbands and kids. How is that normal??? What I'm asking is that I liked it 5 years ago but, they are all in love with husband,but they use my mouth 2-3 times per week and I am afraid that one of the husbands will find out.