Yes strictly massage, different masseuses offer different extra services though. So obviously you can check at the start of the session what is and isn’t potentially on offer, of course any extra that they offer is at there discretion though and they have a right to refuse any particular service regardless of whether they’ve provided that too another punter previously.
There is no penetrative sex though. If you’re looking for sex I suggest seeing a full service provider instead. Don’t bother with sensual massage as you will likely leave feeling disappointed and frustrated.