The thing is I'm not only interested in sexual relationships I'm interested in love too whether it's a serious/long term relationship or a casual short term relationship. I even specify on dating sites that I'm not ONLY looking for sex. I'm looking for anything tbh whether its a life partner for a long term relationship or a FWB/one night stand.
Saying you're not ONLY looking for sex still implies that you expect them to put out, which is actually pretty forward.
I would imagine that asking for sex and romance is probably worse than just asking for sex. You're going to put off the people looking for something casual, as they'll assume you're going to get clingy... and you're going to put off the people looking for a relationship as all they're going to see is that you expect to get laid.
I don't know how successful you're going to be with a non-gay-man profile that says you just want sex, but if you do go that route then you should probably be sure that you can really have sex with someone and then not get attached-- some people are wired that way, but I would say most aren't... and if the real sex-seekers pick up on you being anything less than completely NSA they're going to be put off. I suppose some won't care, but we're talking about damaged people here. I say that just because I can't imagine that a psychologically healthy person would be able to jump from partner to partner and feel good about themselves.
If you are looking for a relationship, then don't talk about sex and emphasize your other qualities in a way that people can relate to. No one is going to say 'Oh look! He likes sex and so do I! We must be made for each other!'. Market yourself (and online dating is marketing) as someone approachable and worthwhile and the sex part will come when you find someone you click with.
Being preoccupied with who is getting laid/not getting laid yourself is only going to push potential partners away.