Hey! The mentally challenged need sex, too. I personally try to make a point of sinning every day. Lately I've been coveting my neighbor's wife. She's a hottie! I look over there and I think to myself, "Man, we could break two or three comandments all at once." Yeah, I'm dreaming, though. Ain't gonna happen.
Immoral to you, perhaps... but certainly not to everyone. Morality is such a relative term... you'll certainly not find your answers here, Felix. Ultimately what matters is how YOU feel about what it is you're doing. If you feel guilty or don't think you should be doing it, then you probably have your answer right there. My opinion: Moral sex is any sexual activity which is consentual to both parties and which does not hurt anyone else in the process (whether directly or indirectly). But again, this is but one man's opinion.
Your partner not being ok with a given practice is an issue, regardless of whether the act is moral or immoral. While I would guess that the majority of posters here would find nothing immoral about premarital sex, these posters are not the person you are involved with. If someone called me immoral for having sex before being married, I would tell them that I'm not christian, so please don't force that biblical BS on me. I couldn't imagine becoming involved with anyone who would judge me for having had premarital sex in the past. However, if that person felt that premarital sex was wrong for him, yet did not judge me, it would come down to deciding whether that person was worth waiting for. Honestly, I probably would not be involved with that person because I feel that a healthy sex life is integral to any solid relationship, I'm not going to marry someone with whom I have no sexual chemistry. Frankly, no offense, but I am a bit concerned that you may be planning to use the responses here to pressure your partner to go for it, since nobody else thinks that it's immoral. That, I would see as immoral -- if s/he is not ready, you have to cope or move on. If s/he has sex because you wouldn't give up on trying, but still feels that it's wrong & feels guilty the next day, that is not genuine consent, that is coerced consent.