9 unlawful things during ihram:

• Cutting of hair
•  Clipping of nails
• Wearing fitted clothes (men only)
• Covering the head
• Applying perfume
• Killing game animals
• Marriage
• Lustful touching of private parts
• Sexual Intercourse

Expiation from the unlawful things

Reference: Al-Umdah by ibn Qudamah Al-Maqdisi

Book 6