As a survivor of a past abusive relationship, I can relate to your struggle.
Intimidation, threats, unwanted sexual pressure/advances, psychological and verbal abuse are clear evidence of an abusive relationship. Do you have fear that the sexual pressure and/or verbal assault could escalate into a violent situation? If the answer is yes, you need to develop a safety plan for your protection. Domestic Violence Services provides counseling, advocacy and help with establishing safety plans taylored to individual needs and circumstances.
You mentioned that you have an appointment with a lawyer. I am assuming that you are contemplating a separation? Keep in mind the following: Statistics show that women are most at risk of violence and death in an abusive relationship when they leave or are in the process of exiting an abusive relationship. Again, this is why DVS and a safety plan are needed.
If you do not want sex, you ALWAYS have the right to say no and have that right respected. Threats of infidelity and rape are the abuser's efforts to maintain power and control. An abuser is deeply obsessed with power and control. When he realizes that you are trying to empower yourself, this will always trigger more conflict.