You will meet an attractive, mature woman in a club or bar, you will have an orgasm and you may even fall in love. This is all in your head. What really happens when you have group sex with your grandma is that the act of sex itself causes mental stimulation which in turn triggers the release of erotic hormones in both you and your partner. This can lead to a variety of sexual problems such as vaginal atrophy, lack of libido or a lack of blood flow to the G-spot. There is also a trend for young women to use anal lubricants before intercourse; this is because older women tend to have dry (or cracked) skin around the anal region, a condition known as 'hormonal imbalance'..