Intimacy has many meanings to many people. However, it usually boils down to being able to be close with others and share your feelings and emotions with them. As any other psychological trait, intimacy can be lacking in some people. Such people are difficult to deal with in relationships, so it is important to recognize intimacy problems in people as early as possible.
1- People with intimacy problems have a difficult time expressing their feelings. So even if your partner loves you, do not expect him/her to say anything about it, even if you have been together for awhile. If he/her is already your spouse, they will not show any signs of endearment often.
2- People with intimacy issues usually have a disastrous history regarding relationships. They mostly will not like to speak about their past relationships, but if you look a bit, you will find that their past relationships ended badly, maybe even with reasons such as infidelity.
3- They love making new relationships rather than keeping already existent ones. This is also infidelity alert. They love the new rush of feelings they feel when starting a new relationship. When the heat of romance starts cooling down, they start looking for someone new to rekindle them.
4- They are somehow cold and distant in relationships. To be more specific, you will find yourself confused about how they think and feel, and whether your feelings and his are mutual.
5- Monogamy is a principle they neither like nor perceive. This is another infidelity alert. People with intimacy issues do not find it wrong to make different romantic relationships at the same time. You might find that the sign of that is that they know many other women and talk to them freely and with no limitations. Also a little more searching might reveal to you that they commit cyber infidelity easily.
I am not saying that people with intimacy issues are a lost case, but be warned! A relationship with one is a bumpy ride.