With Valentine’s Day now just six days away, you’ve hopefully already stocked up on all the presents and chocolates you might need for your girlfriend. If you haven’t, then science has got your back. Despite the erosion of time, gifting on Valentine’s Day has remained fairly static since the days of Victorian London. Flowers in general became the staple before roses rose to prominence during the 16th century. Chocolates came soon after, and the rest is history. What you should buy your girlfriend for Valentine’s DayResearch suggests that men and women typically like very different gifts on Val…