Is it normal that my wife wear the sexy panties to work?

maybe this story should be posted previous to the old one. One of my concerns, that during last 3 years all sexy lingeries that i bought to my wife on valantine days did not wear them for me, as per her opinion that she should surprised me and not wear them when i excpect. but as i mention i never see her wearing them. but i realised them many times in the dirty bascket for wash. and when i asked her how come that they get dirty, always she reply the same answer that she wear them in the morning before she goes to work in order to surprise me when she's back. but she found them dirty from her pussy secration and obliged to change them. i asked why she didn't wear others since thay are planty. she get confused and doesn't answer. is it normal that a woman wear sexy lingerie to her work??