You will need at least 50 HP and 15 Charm to go on a date. To have a successful date you will need to raise the Mood to 6/6 and kiss the character.
Dates are a great way to increase your Relationship.
Once you have enough successful dialogues with the character, a message letting you know that you can now give gifts to the character will appear.
You can't give gifts to characters right away after meeting them.
Talking to characters will increase your Relationship EXP with them.
For band members, you will be able to enter their room at the Cobalt Apartments once your Relationship EXP is high enough with them.
Gifts are a great way to increase your Relationship EXP.
] and keep clicking 'More...' until you find the button that says 'Make me Alien Pregnant'.