The outer thigh can be very sore on some patients and quiet mild on others. If your partner is quite physically active, this area will be sore, especially if they play any racquet sports or other lateral-movement activities.
ShopInPrivate.com has a number of different massage products you would probably like. If you are massaging a man, choose Kama Sutra Healing Blend massage oil, if you are massaging a woman, the Pleasure Garden Massage Oil is a great floral scent. Look also for massage creams. They are available in a number of sweet, edible varieties. Finally, silicone based massage oils are available now. These products spread very well and are also condom safe. Here is System Jo brand silicone massage oil.