Its slutty if you give head to random men. Its being a hot lover if you do it to the man you love. If he treats you well, if he appreciates it when you do this, and if he does similar things for you then there is absolutely nothing wrong with giving him pleasure. He isn't thinking "what a ", he is thinking "wow, I have the most wonderful girlfriend in the world". I don't know him, but for me having my wife suddenly walk up and give me head while I was doing something else would be fantastic. (and if I thought she wanted it, I'd do the same for her). As far as technique - Oral can be varied a lot - attitude is the most important. You can be submissive, serving his every wish, you can be sort of dominant, "making" him finish. You can be silly and teasing. All of these are fun and provide variation. More generally for sex you need to find out what he likes, and what do you like. A lot of couples enjoy some light bondage - tie him to the bed and then take care of him v e r y s l o w l y. Or roleplaying - you are the new harem girl sent to the sultan. Watever - there are lots of options.