Is it normal to masturbate onto my wife's panties?

When my darling wife is away on business, my natural male urges sometimes get the best of me. I will occassionally take out one of her black panties( for contrast purposes)and I will lay it on the bed. Then I will take my penis out and stroke her panties while lying on the bed fantazing about my darling wife till a hot climax.

BTW...I do the laundry in the house...so my wife is totally unaware of my "activites"