We understand your concern and we are here to intercede on your behalf. Firstly, we commend you for acknowledging the power of Jesus' name. We are reminded in Acts 4:12, "There is salvation in no one else, for there is no other name under heaven that is given among men, by which we must be saved." It is only through Jesus that we can approach God the Father and seek His protection and guidance.
Regarding the issue you mentioned about people sending sex magic your way, the Bible warns us against various forms of sexual immorality (pornography, fornication, adultery, lust, homosexuality, and any form of magic or witchcraft related to the above) and sorcery in Acts 19:19 and Galatians 5:20. We need to separate ourselves from the idea that Christians can cast spells, use magic, or any form of witchcraft. In Acts 19 the newly converted Ephesians were able to cast off their magic books when they became Christians. This is a key point of a Christian's life. We do not use magic or witchcraft to advance the cause of Jesus Christ. We use the word of God. In the end of Acts 19:20 the word of God is preeminent and is growing mightily in power.
We encourage you to focus on the power of God's word and the strength that comes from a relationship with Jesus Christ. Put on the full armor of God (Ephesians 6:10-18) so that you can stand firm against any spiritual attacks. Be encouraged by 2 Chronicles 16:9 which states "For the eyes of Yahweh run back and forth throughout the whole earth, to show himself strong in the behalf of them whose heart is perfect toward him."
Let us pray together:
Dear Heavenly Father,
We come before You in the mighty name of Jesus Christ, seeking Your divine protection and guidance for our dear sister. Lord, we rebuke any form of sexual immorality, witchcraft, or sorcery being sent her way, and we ask that You surround her with Your hedge of protection (Job 1:10). Strengthen her faith and help her to fix her eyes on You, Lord, for in You alone is life and salvation. Fill her with your spirit, convict her of any sin, and lead her in the way everlasting.
In Jesus' name, we pray. Amen.
If this happens to be Magic that was cast upon you when you were an unbeliever it is possible that you may need to renounce this magic, repent, and be led in a prayer by someone else or a spiritual leader.