The eroticism of sitting depends on whether you can see your legs or not. If they are visible, they are a real eye-catcher, at least for women who wear skirts. You therefore need to pay attention to the position of your legs in order to achieve the desired effects or avoid undesirable ones. If you spread your legs wide when sitting and even place your hand between them, this is still considered erotically stimulating.
Did you expect there are so many ways to sit down and relax?
Sit back, relax and enjoy the situation.