Is it normal to love the sperm bank so much?

The thing that has kept me interested in my wife is her ample, soft and firm behind and if a female has big boobs it does little to excite me but an ample, feminine, firm and shapely ass I hold in high esteem.This was a planned blessing from God.Before we married my wife told me that the only man she would give anal to is her husband and after all these years I never asked but she says that is because I never got over how good pussy is. The woman knows me.Is it a normal thing for a man to be so fond of his sperm bank he don't make deposits any where else?