I no longer offer DFK or even closed mouth kissing and I am so much happier in this job now. Don't ever be afraid to only offer the services that you want to and feel comfortable offering just because you think you will lose business, because punters who want your current services will book you now and if you change your service list then new punters that want what you will offer in the future will come out of the woodwork and replace that 'lost business'.
You will even attract new punters who once thought you were 'dirty' or something because you offer OWO for example suddenly thinking you are 'clean' because they see it disappear from your profile and vice-versa, that's right ladies guys don't count all that bare cock you've sucked in the past as long as you haven't done it too recently LOL. So in your case someone who doesn't want the GFE will book you because they want a quick, hard shag with no strings attached, it's all about the kind of punter you want to attract, a sweet guy who wants to 'make love' and will grow attached to a prostitute over time or the guy who just wants to empty his balls as quick as possible and then fuck off, either is fine and advertise accordingly for the kind you require.
Oh and I've lost no business since I decided to offer all services covered and implemented my no kissing rule, regulars stayed and accepted my rules and newbies accept what my advertising states if they don't I don't see them, end of. I'm in a LTR and I only want to kiss/suck bare my husband that doesn't make me a bad whore, it just means my priorities of the job have now changed. Don't feel guilty OP re-work your approach so everything about your job is how you want it to be, you'll be much happier and last longer in the industry.