Rule 1.5 Fees

(a) A lawyer shall not make an agreement for, charge, or collect an unreasonable fee or an unreasonable amount for expenses. The factors to be considered in determining the reasonableness of a fee include the following:

...


(b) The scope of the representation and the basis or rate of the fee and expenses for which the client will be responsible shall be communicated to the client, preferably in writing, before or within a reasonable time after commencing the representation, except when the lawyer will charge a regularly represented client on the same basis or rate. Any changes in the basis or rate of the fee or expenses shall also be communicated to the client. All agreements for the advance payment of nonrefundable fees to secure a lawyer's availability for a specific period of time or a specific service shall be reasonable in amount and clearly communicated in a writing signed by the client.

...


Rule 1.7 Conflict of Interest: Current Clients

(a) Except as provided in paragraph (b), a lawyer shall not represent a client if the representation involves a concurrent conflict of interest. A concurrent conflict of interest exists if:

...


(2) there is a significant risk that the representation of one or more clients will be materially limited by the lawyer's responsibilities to another client, a former client, or a third person or by a personal interest of the lawyer.

...


Rule 1.8 Conflict of Interest: Current Clients: Specific Rules

...


(j) A lawyer shall not have sexual relations with a client unless a consensual sexual relationship existed between them when the client-lawyer relationship commenced. For purposes of this paragraph:

(1) "sexual relations" means sexual intercourse or any other intentional touching of the intimate parts of a person or causing the person to touch the intimate parts of the lawyer;

(2) if the client is an organization, any individual who oversees the representation and gives instructions to the lawyer on behalf of the organization shall be deemed to be the client; in-house attorneys while representing governmental or corporate entities are governed by Rule 1.7 rather than by this rule with respect to sexual relations with other employees of the entity they represent;

(3) this paragraph does not prohibit a lawyer from engaging in sexual relations with a client of the lawyer's firm provided that the lawyer has no involvement in the performance of the legal work for the client;

(4) if a party other than the client alleges violation of this paragraph, and the complaint is not summarily dismissed, the Director of the Office of Lawyers Professional Responsibility, in determining whether to investigate the allegation and whether to charge any violation based on the allegations, shall consider the client's statement regarding whether the client would be unduly burdened by the investigation or charge.

...


http://www.law.cornell.edu/ethics/mn/code/MN_CODE.HTM